I'm very sorry that you lost your Green Cheek, I have a 2 year-old myself and he's the love of my life, so I understand how devastating it is to lose your baby. Noodles asked you a very good question, and I hope that it's not too invasive for you but know we're asking it out of concern, but do you know what killed your Green Cheek? The worries are obviously environmental factors such as fumes from gas, cleaners, smoking, candles and scented things like Glade Plug-in's, and of course if your family uses ANY pots, pans, bakeware, etc. that are non-stick Teflon-coated, or any space heaters, blow-dryers, air conditioners, etc. that may contain Teflon coating inside of them; or possibly you have any other pets that posed a threat to your bird, such as dogs, cats, large reptiles, rodents, etc. You certainly need to completely disinfect EVERYTHING that your Green Cheek touched, regardless of whether or not you get a new bird, like the cage, all the dishes/bowls, toys, perches, swings, play-stands/gyms, etc. in very hot water and bleach, and make sure you rinse them all very well after to remove all of the bleach smell (if you haven't already done all of this)...
I don't know how old you are, I'm assuming that you're a teenager though based on your school schedule. So what you need to ask yourself is not only whether or not you have enough time every single day for a parrot right now, but you also need to think about the next few years, because as you know, a Mustache Parakeet should live the same lifespan as a Green Cheek Conure should, around 30-40 years. So due to your age right now, you're probably going to be going to college, university, technical school, etc. within the next couple of years, and you most-likely will not be able to take a parrot with you, at least not for the first year or two. So you really need to ask yourself if you're going to be able to leave a parrot that is bonded closely to you behind in someone else's full-time care for possibly years...Is there someone who will be willing to care for your parrot when you go away to college, and even more importantly, will that person be able and willing to spend at least 4-5 hours every single day with the bird? I know that these aren't the things that you think of when you're a young teenager, but better you think about it now than be stuck in the position of having no choice but to re-home your parrot a few years down the road because it will be forced to be stuck inside it's cage all day long, every day, while you're away at school.
As far as right now goes, you need to keep in-mind that a Moustache Parakeet isn't the same size as a Green Cheek, they are a good bit larger, and they have a very different personality than a Green Cheek as well. So I'm not sure what lead you to wanting one, but you need to make sure that the current cage you have is large enough for a Moustache Parakeet, because they are going to require a good bit more room than your Green Cheek did. Also, he's going to need many, many toys and foraging activities inside of his cage at all times, at least 6-10 different types of toys at all times, with new ones rotated in each and every month; for example, one or two wooden toys for chewing, one or two toys meant for shredding, one or two toys for foraging, etc. So you need to ask yourself if you're going to ALWAYS have enough money on-hand every single month for all of his food (a bag of high-quality pellets, a bag of high-quality seed-mix, then fresh veggies, fruits, treats, etc., plus a mineral block), and then also new toys or at least the stuff so you can make/build him new toys and foraging activities each month....Food alone, meaning both a high-quality pellet and seed-mix along with fresh veggies and fruit, will cost you around $40 or so a month, on average...
Then there is the matter of Veterinary medical care....Avian Specialist Vets are usually more expensive than just your regular General Vet who see's dogs and cats, and you must always be able to immediately take your parrot to either a Certified Avian Vet or an Avian Specialist Vet (please avoid Exotic's Vets if you can, as they have no specialized Avian education or training, and it often is the difference between your bird living or dying). It's not fair to your bird if they become sick or injured and you do not have a special savings fund to take him to the Avian Vet, or if your parents aren't willing to pay to take them. We see this a lot, younger kids/teenagers who come here looking for "home remedies" because their parrots are sick or injured and their parents refuse to pay to take them to the Avian Vet. It's just not fair to the bird, it's irresponsible as a bird owner, and it's something that you should always think about BEFORE you bring home a new pet. Figure a regular wellness-exam with a CAV or Avian Specialist usually costs between $60-$100, and then any blood work, x-rays, cultures, etc. are on top of that. So if your bird become ill, say with an infection of some kind and requires a wellness-exam and then a fecal culture to determine what kind of infection it is, and then also needs the correct medication to treat the infection, all of this is going to cost you on-average around $200 a pop. So if that's not going to be a possibility for you to do at any given, sudden time, then the responsible thing to do is to not get another bird...But I don't know your situation or your family's involvement in this, etc., so I'm just putting this out there...
SO hard...
