1. there are no 2.3 available yet (ask gten about drivers and such)
2. all 2.2.1 will be desktop compatible with flash, but you do know that hulu activly blocks us mobile connections right? although there is a hack for that, i dont belive it is cooked in to any roms. you can find more about it here.
http://forum.ppcgeeks.com/sprint-epi...work-epic.html
3. jit will be enabled on any 2.2s you flash.
4. over clocking is a kernel thing. better read up some more. this aint winmo. there is more to it than just flashing roms. there are roms kernels, modems, and bout 4 diffrent ways to flash them. some use clockwork, some people use odin, some people use heimdall, some people use a stock recovery. look in to all thius first.
5. there is an app for that. lol
6. some sprint bloat were is pretty handy. the sprint zone app lets you do connection tests and acts like a sprint.com app. you can use it to check up on all the phones on your account. i like it, but ehh.
7. give touchwiz a chance. i think it has some useful pluses and a few widgets i couldnt live without.