A CPU is a CPU, they all do the same thing (although obviously with different degrees of performance, etc), so Im not too concerned what it is. Standouts in recent times though would have to be the early Athlon64's,... sure theyre outdated by now, but it was that cpu that forced Intel to pull thier thumbs out and probably plays a big part in how cheap and powerful hardware is these days. Core2 (duo/quad) is the other stand out. Low power consumption and heat dissipation (for a cpu of its class especiialy), and very overclockable, even with modest (retail cpu box) cooler.