Personally I'd want a bit more power for your future configuration than 430W. I'd prefer to run at no more than 80% of the psu's requirement, and your 2x5770 looks like it might draw 400W. Though Antec makes some great lines, and I've not seen a review of the Antec Neo's performance/quality.
Well the thing is, I'm going to being doing a ton of gaming on it. And when I see gaming rigs for sale that are pre-built, they always have at least a 750-watt PSU.
yeah but they have generic power supplies with peak watt ratings at unrealistic temps. most can barely provide 80% of their listed power in an actual gaming PC. also the majority of their power is not on the 12v rail which powers your CPU and GPU.
a solid built unit will list its continuous power at high temps with most of its power on the 12v. a corsair 550w for example will peak at close to 650w. A lot of companies would simply sell that as a 700w PSU and call it a day.
for example here are two reviews of 450w PSU
"This unit can’t deliver its labeled power – like Elite Power 400 W, it can only deliver up to 420 W. To make things worse, this unit is sold for USD 10 more than Elite Power 400 W – an extra 33% profit for Cooler Master for counterfeiting their own power supplies."
You will bring home a relatively inexpensive power supply that even though is sold as being a 450 W unit can deliver up to 570 W at 48º C – in fact Corsair could have easily labeled this power supply as a 500 W unit, but they preferred to stay on the safe side. http://www.hardwaresecrets.com/article/Corsair-VX450W-P...