all good suggestions so far.
I bought the 8800 for my 40 and I regret it. I don't use the dual channels at all and the 8800 uses a fan to cool which is not suitable for the dusty interior of my 40. It was more than twice the cost of the 2900, which is what I should have gone with in the first place. I'm planning on getting a 2900 for the 40 and moving the 8800 into my other rig.