got like 10 ?'s. fig this was the brawdest forum! plz help

k im getting a premodded xbox with a ex 2.6 i think it is. That and lights cut in the top of it a new dvd drive in it and a 120 gb hd installed.. now my questions are. is the ex a good chip? is there a lot of game that are compatable with it? If so, mabey someone can make a list the games that can be backed up and played with the chip therefor, not need the hard drive to boot it.Also a list of games that have to go to the hard drive cause the chip wont read the back up. Next question, I also want to play xbox live not with the back ups with originals tho. Will my hd be detected? Is there a way to swith back to the 8/10 gig one for when im online with xbox live? There is another online play for xbox called kai or evol or somthing. Can someone explain that to me how it works? How can i swith from that to xbox live pretty easy? And the pros and cons of it.
Also a list of games u can have ur own music stored on the hd so it plays in the game. for ex nfl 2k5 and stuff.
ty
ty
ty
ty

finilly im paying 300 for the xbox and all the junk in it is it a good deal note the xbox is a used one .
best regards,
ty
cac