FSP is a source manufacturer for a number of oem power supplies.
I would not classify them as bad, but I think there are a good number of tier 1 or 2 units out there that can be bought for a similar or lesser price.
Look for Seasonic, XFX, Antec for starters.
A GTX980ti can run on 600w, 550w with a good quality psu.
I have no problem overprovisioning a PSU a bit. Say 20%.
It will run cooler, quieter, and more efficiently in the middle third of it's range.
A PSU will only use the wattage demanded of it, regardless of it's max capability.