I am currently shopping to build a brand new gaming PC. I am limiting my budget to $2500 (Not including taxes). I would like anyone's word on this build and what I can and should improve/change without topping my budget.
Buying a seperate card for PhysX is a ripoff. Not many games use it and the 680 is a mighty fine card to do PhysX on its own. I would stick with 1 680 for now, it's easy enough to purchase another later and SLI it if you want.
Again, you are overpaying for RAM. I know your budget is higher, but I still don't want you to be frivolously spending money on things that don't help your system.
1 680. Those will be in production much longer and you can always SLI at a later time. You won't need to for a while though, the 680 is a beast. Plus you get the benefits of 28nm silicon (Less power consumption, less heat!)