In that case wait. NV has it's die shrink out soon, plus they are dying a bit of a death with the 200 series so expect something new pretty soon from them, they have too although I haven't heard of anything.
ATI seem to be stealing the lead at the moment and ED games seem to prefer ATI architecture, and on that subject ATI apparantly has something new in the works and if this is the case NV have lost this round and need to regroup.
The NV cards at the moment seem like good cards, but have a few problems, one being the price. The ATI cards have there own problems but they cost less.
The 4870x2 is a great card and is the fastest on the market at the moment (when it used to it's full potential).
I am due a new GPU and I am just waiting until the new year, new card and BS in the same few months.