EVGA recently added two members featuring 550 W and 650 W capacities to their G2 line, which was a very smart move since a lot of users are now asking for highly efficient lower-capacity PSUs of good build quality and increased reliability. Such a combination could so far only be found in high capacity PSUs. However, take into account that such powerful GPUs as the NVIDIA GTX 980 are far less power hungry than previous-generation GPUs, or compared to everything but the R9 Nano on AMD's side, and a 1 kW+ PSU is usually overkill. A low-capacity PSU is usually also significantly more efficient at light loads, which is a great asset because modern systems consume very little energy in idle and low-utilization scenarios.
A PSU like the 650 G2 will, after all, last through many system builds, outlive many GPU generations. We see the purchase of a branded PSU as a true investment and would encourage you to see it as one as well.
EVGA SuperNOVA 650 G2 Power Supply
80 PLUS Gold Certified
+3.3V@24A, +5V@22A, +12V@54.1A, +5VSB@3.0A, -12V@0.5ABuy Now from Amazon