If money really is not an object...then by all means get the biggest you can.
A good deal right now I think is the Intel Core2 Quad Q9400 2.66GHz. It's a 45nm design and from what I have read it's a good overclocker. The price is about $270 and it almost always comes with a free game. Some people will say go for the Q9550, which is a great processor, but the extra $50 for .17 GHz I think is a waste. You could run the Q9400 up around 3GHz without putting a lot of stress on it. That processor will last you a long time.