Should i trade in my xbox 360,wii,PS2,xbox, and like a lot of games? for a PS3?

i wanna trade these in because all of my friends hae PS3s and i wanna get one w/ modern warfare 2 so i can play online w/ them. my games are...

360-MW2,NCAA 09, the lord of the rings conquest

Xbox-like 5 old games from like 2007

wii-mario party 8, Fifa 09,harry potter,pirates of the caribbean, mario super strikers charged,

Ps2- like 8 games from a while ago

how much will this get me will it be enough for a PS3 and modern warfare 2?Should i trade in my xbox 360,wii,PS2,xbox, and like a lot of games? for a PS3?
Why do you keep overposting this question? You put it on here like three times!