Store Return?

[dipset420]

I have an xbox 360 and the other night i got the ring of death so i need to get a new system. i bought it last year in april and i got an extended warranty from circuit city.
now can i exchange it for a new one or do i send it to microsoft and they send me a new one. and if circuitcity will give me a new one will i have to give the Hard drive back too, because i bought the premium but i have a lot of downloaded content on the hard drive and i want to keep it.
also if circuit city does give me a new premium 360 which is worth $400 dollars can i pay an extra $80 dollars and get the elite which is $480 dollars or do i have to just get the premium.


thanks for the help