It is still a decent PC of course but I'd not bother with the 2x8600GTS in SLi, a good single card is almost always better, less hassle and cheaper than 2 mid-range cards which is what you'd have there. Unless you already have them (and that was quick if you do) I'd suggest an 8800GTS instead as being better value for money and without having looked at the figures probably about as fast.