Oh ok, yeah that PSU is fine. No need to replace them until they die. 2 years old is nothing.
Fair enough, at the very least make sure the tower is long enough to fit a decent sized graphics card in it, you should be ok though.
I couldn’t imagine that they would charge too much. If you do decide to give it a go yourself, there are plenty of people here for guidance.
With the way that the sandy bridge CPUs clock, I’d say you’d be looking at 4.00GHz minimum.