I would STRONGLY recommend the EVGA 110-B2-0750-VR over the B1. It is a much better PSU and only $50 in the USA. If you are elsewhere, there should be better XFX PSUs at similar prices. If not, link to a site and we can look and see what your best option is.
There's nothing cheaper or less powerful that is any better and it will handle pretty much anything up to and including SLI GTX970s.