first i wanted an xl...then i thought "well for 100 less i can get a card that won't last long(6600gt), but i can use that 100 to get a better card in a year or two" now i'm thinking that i could get a 6600 vanilla and use that extra 140 that an xl would normally cost for a new card in a year or so. can the vanilla play games like doom 3 at 10x7? can this card be overclocked to gt speeds (memory too)? finally...which company seems to overclock better or just be generally more reliable for graphics cards. (my first computer) i'm really liking the asus 6600 vanilla because it has no fan 