Between $10-15 for shipping and $7 for restocking means there is no monetary advanctage to doing it. System:
Core I3 2120
HiS 6950 1GB
1xSSD, 1xHDD, 1 DVD/RW
Couple of case fans
Don't plan on OCing or CF/SLI so the 520W is more than powerful enough to run my rig. I'd get another 100W, but the difference in efficiency at the load levels i'll be at are minimal. Would the 620W be sweet...yes. Do I really need it...maybe no.