I love my 7405! It was a great value, because i got it off of bestbuy.com with $250 instant savings PLUS $150 MIR. It plays Hl:2 fine and Doom3 OK with the omega drivers. But my favorite thing about it is the processor, AMD64, so i can...
personally, i always use the deep analysis, as quality>time IMHO. plus if you set it to automatically analyze the disc before burning, you can just start it up, go do something else and come back in an hour.
if you decide to install gentoo, install it using Knoppix or another similar livecd, so you can use Mozilla or play a few games while compiling(it makes the process so much more bearable). In the gentoo handbook, it gives you specific...
unless you really want it, PCIe is unnecessary, as almost no one can totally swamp a 8x AGP bus. The only reason(in my oppinion) to go with PCIe is if you want SLI support
OK, here's what I would get if I were you:
Processor
I would definately get the Athlon64, as it will be much faster than the XP. It runs 32-bit stuff just as fast, if not faster than compairable Intel processors. I would get either...