I second the motion to build it yourself. I just built one and it's fun -- I learned a lot and saved money, besides.
I bought everything from NewEgg. i7 Intel processor, Gigabyte motherboard, SSD, Radeon 7770 graphics card.
You'll want a better graphics card for gaming. Or maybe TWO of them in crossfire. You could make yourself a really crazy, water cooled screamer of a machine. It looks like you could do that on Falcon NW, too, but it wouldn't be as fun.
Tom's Hardware is a great resource.
I started to spec out a Falcon machine and it was about twice what I spent, FWIW. (Not an unfair price, just higher.
Are you serious about the billionaire thing? It would be very tempting to build a completely nuts, multi-monitor rig. If your boyfriend has gaming friends then the hardware is probably a source of competition you can milk.