I was actually thinking since I am a gamer and my machine already old, I will get 4X7970s running in Quad-Crossfire, actually put on a decent ram and CPU anduse it for gaming and have it mine novacoins and litecoins in the meantime.  If it pays for itself in a year that way, I would be pretty happy with that. Unfortunately, I do pay for my own power.  Also, I see everyone saying 7950s, but what about 7970s or even the new 7990s?