It's easy enough to get hold of an old P2 or P3 nowadays for nothing anyway, and you'd be surprised at how well some of the stuff found on the side of the road works. I acquired a 933 MHz P3 which i now use as my server on a verge collection, and it works perfectly.
For emulation, the most important thing is probably the processor, especially if you're emulating the saturn you'll want to look into getting a quad-core. Graphics really don't matter as long as your card has enough memory to run Direct X apps at native resolution on your monitor.
Only a DS flash card for me.
I havn't gotten around to modding my wii or gamecube, my dreamcast and mega-cd don't need modchips , and my saturn is a model 1 so i can't mod it anyway,
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