If I may, I'd recommend a Pentium 4 based system if you go single CPU. The latest P4 CPUs have 512Kb cache so they be smoking in many things. Of course it gets tough when you decide what you want to do for RAM. You already have half a gig of SDRAM which I'd hate to put aside unless you're COMPLETELY doing a new machine. If so then I'd go for a DDR or RDRAM based P4 solution. On the Dual CPU front it would be a tough choice and dependant upon your budget. The AMD MP processors are smokin' but like to run a little warmer than Intel. Of course you may save a bit more going that route though. The XEON processors are the only way you can go Dual if you want to go above 1Ghz on the Intel side. I'm sure KBob will offer some insight to Dual CPU usage and performance. Right Bob? :-)
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