I have a few systems, but I can't vote more than once...my vote goes to the Pentium 4. =0P
AMD AthlonXP 1900+
Intel Petium 4 1.7ghz oc'ed to 2.1ghz
Intel Pentium III 1ghz
Intel Pentium III 866mhz
The only reason I have so many systems is because my g/f likes to play on the computer(so obviously I have a seperate system for her) and I like to have LAN parties, plus it isn't bad having other systems to store file bakups on in case something goes horribly wrong with the hard drive in another system.