Ive been taking a look at power game factory, and Im impressed. The user interface is actually really good. Might give it a little bit more. To bad its only Platform.
I say to build you'r own. You can get a decent computer for a much less dollars(or other valutas). You can also ensure yourself to have the best without having to pay ridicoulusly high price.
Ok, so I installed 64-bit today. Success! Everything is running fine and smooth. Not much difference though. Just says 64-bit. Gonna get 4GB more on saturday.