i have $70 best buy gift card, what game should i get?

well i got a $70 best buy gift card on xmas along with my new PS3. Im planning to buy something but i dont know exaclty what. It could be a ps3/ps2 or any accessories that adds up to 70 dollars.

I need a game that will last me a LONG LONG time, im saving up for an HDTV and i cant keep spending on alot of games so i need one that will last me till April next year or so. At first i thought of using this 70 dollars to add up for my HDTV, but i dont have much alot of ps3 games so im thinking of getting one more.

EDIT: o ya i forgot this is what i already have
uncharted
UT3
COD4 on my brothers xbox360
GH3 on my bros 360
heavenly sword (not opened yet)
assassins creed and mass effect on my bros 360
warhawk

thanks in advance

i would get COD4 I think it is still on sale for 39.99 at best buy

COD4 on my brothers xbox360

jquest123

so, get it for YOUR PS3