It's always best to plan ahead for future upgrades, so adding a 1000w - 1200w is a very good idea, especially if you might end up adding a 2nd 4GB GTX680. All my systems have PSUs that range from 1200w to 1600w, do I need that much power ? not really, but it's nice to have in case I do.
As far as buying a good PSU, Seasonic makes some of the best power supply's out there, so take a look at their X1250, the Corsair AX1200i is also another great PSU, and they do sell sleeved cable sets in different colors, Next would be the PC Power & Cooling 1200w Silencer MK III, then the Enermax
MaxRevo 1500w is yet another great PSU, we have a review coming up shortly, but the cables tend to be very thick, on Enermax PSU's, especially the 24 pin, so make sure you use a case with plenty of room between the back of the mobo tray and the side panel. All the PSU's I mentioned come fully
modular, this way there's no need to hide cables that you will not be using, just install what you need. I hope this information helps you out.