you're definately behind the curve for new games, when I got to that point with my old P3 450mhz, I considered the upgrade, but it was gonna max at 1.2g if i kept the mobo, if not I was going to be rebuilding the whole thing. I ended up buying a whole new system, and .
the really nice part is i can keep the old one runnign downloading apps all day long, and never get a performane hit on my new rig. then I just slide them across my network onto the new rig.
I was pleased to see that the prices have come down alot too, my old rig was near top of the line @ $2000 and my new one was only $1200 (no monitor, cuz I've already got a bunch)
also you can get a KVM switch that will let you use the same Keyboard, Video (monitor), and Mouse for multiple Pc's, just push the button to switch.