At this point I really don't care about playing PS2 games on my PS3 even though I haven an original 60GB. The emulation method causes lag and those old games looks like junk upscaled on my LCD. PS2 emulation on the PC has come a long way anyway and will net you much better results visually. Even if it's not 100% accurate just yet.
PC's seem to take a similar leap every console generation in terms of software. You can't stay up to date in hardware for longer than 4 month though. Either way my 2 year old GPU(Radeon 4850) and 4 year old CPU(e6300 overclocked to 3.1 ghz) seem to keep me afloat still.