Interesting review... but I intended to buy one 680 now and add one more in a year or so in order to make my rig last as long as possible. Thats why I am aiming for 4GB 680 at the moment.
I have Maximus V Extreme motherboard, i7 3770K CPU, Enermax Platimax 1000W PSU and 16GB of Corsair Dominator GT @ 2133MHz already... only missing GPU. But I think that I will wait a bit more for this ZOTAC AMP2! 4GB (not listed on their page, but it should be soon I think), or I will end up with EVGA.
Already spent so much money on this rig and I intend to use it for the next 2 or 3 years... thats why I want 4GB.