Wow, thanks for all the responses! Iggy is clipped, I couldn't imagine being divebombed by him (I am amazed by your pictures of your birds flying, Peta)!! Also, I did take the top of his playgym off so that he is always below eye level, and his dinner stand is fairly short. His cage IS taller than me, but that doesn't seem to be much of a problem since he's always out of his cage when I'm home. But despite the fact that he is clipped and always lower than me, that's when he chooses to attack and scream and be a nightmare...which seems strange. When he bit my neck last week, he jumped off of his dinner stand and grabbed onto the back of my shirt and proceeded to reach up and take a chunk out of my neck even though he had been lower than me. So far the floor punishment is still working...
I'm sure you're all very right with not letting him see that I'm afraid of him, and it's definitely easier said than done, those bites HURT (as you all know)!!!! I'm trying to pick times when I know he is calm and pick him up with my bare hand for a few seconds and then put him down and tell him what a good boy he is the whole time. I figure that might be a good way to work back to trusting each other...I held a female orange wing amazon yesterday who would never dream of biting anyone, I was in complete awe, but it reminded me what Iggy was like before, and I felt a little bit better and more confident.
And don't worry, I have no intention of getting Iggy a friend, it definitely sounds like an all around bad idea...I think they would pretty much egg each other on all day. And then I might just jump out of a window...but I do want a sound proof bird room someday when I own a house (which is not for a long time, lol).
I'm trying to be patient with Iggy, and you guys are such a huge help, I look forward to reading all of your suggestions and ideas every time I come on. It really helps to have a bird support group

I'm going to try to keep him past mating season and see what happens, which shouldn't be a big issue because who would want to adopt an aggressive amazon anyway?
Once again, thanks to all of you, sorry for the verbose response!