Dont want to jinx anything, but so far things are going great!
He explored all over his new cage and new toys and wasnt scared at all. He went right to sleep and didnt make a single peep all night (i was really worried about him squawking in the evening and waking up my 2 year old who is asleep by 7pm). This morning he seemed glad to see me and stepped up immediately when i asked him to. No agression or fear at all about coming out of his cage. He ate a hearty breakfast (the tiel didnt. The first day he was here he was so nervous he barely ate or drank anything. It made me really nervous). He started dunking his head in his water bowl, so i offered him a bath, which he took and seemed to thoroughly enjoy. Then i put him back in his cage so i could cook breakfast. He went back in no problem- no fear, no agression. He sat in there happily amusing himself while we ate. He was making little clicking and cooing noises to himself, but no screaming. After breakfast, the tiel was playing on the play stand. It's a really big one, with lots of toys and perches, so i thought i'd just see what would happen and put the sun on it too (on the opposite end from the tiel). I was 100% supervising and ready to leap in to stop any problems, but i didnt need to. They looked at each other for a few min, interested, but not defensive or angry looking at all. Then they proceeded to ignore one another and play with toys, preen for awhile, and then fall asleep. They've been napping contentedly next to each other for the last 1/2 hr.
I'm not a fool, and realize things could change at any time, but so far everything is going better then i had even hoped for!