Welcome to 64-bit computing Bert. I, too, am an ex AMD-only guy.
I chose a Q9550 QuadCore over the i7, purely because it has established itself and is proving very reliable in the graphics trade - which I'm in. It also runs 12Mb of level 2 cache vs 8 I think for the i7, which people I know at Adobe have said lets InDesign and Photoshop perform a little faster in benchmarks.
Either way - you'll love the speed. Vista Ultimate 64 is a killer. It has been ROCK solid on this box. I also run 16Gb of RAM, so it isn't exactly starving...
Have fun with it.
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