On what settings? Medium?
High settings. I have played games like Crysis, Doom 3, Quake 3 Arena, Unreal Tournament etc. just when they came out and I did not even spend more than 150 Euro for my graphic card. The good thing about a PC is that you can exchange your hardware whenever you want and what you need. You don't need to buy everything new at the same time because some hardware can be used longer than others.
I've also build myself a HTPC with Blu-ray and DVB-T instead of buying a normal receiver. Now I can watch Full HD TV, Videos, newest movie trailers etc. all out of the box in my Media Center and I've uncountable functions and possibilities. All this for 400 Euro while 99% of the population still hang around with their cable TV
A self-built PC will always be a better solution than any out-of-the-box system like a console, receiver or a complete PC system from Dell, Compaq or god knows what. Better hardware for a cheaper price.
Anyway IMO consoles have the better game exclusives for my liking.
Surprising given the fact you prefer to play ego-shooters.