[citation][nom]luciiacob[/nom]True! Synthetics do help when it comes to that comparison. I didn't think of it. Sorry.
On the other hand, I honestly believe that no 800$ 1½ years old rig can stand up to a today's 500$ rig (so...no need for a synthetic benchmark when it comes to this decision ). That's because prices drop at half after 1 year and today's overclocking capabilities are way better that 2 years go. Also, bear in mind that applications and games also need newer technologies to be supported by the hardware, not just higher frequencies and capacities.
Also, are you really going to spend 500$ on a new rig if you've spent 800$ 1½ years ago? Since my first Pentium 1 PC, about 10 years ago, I've always doubled the amount of money that I spend on a new PC every two or three years.[/citation]
Just under years ago I built an intel system for a friend. It had a ga-965p-ds4 board and an e6400 cpu. That cpu still today runs at 3,4ghz - that's more than the e2180 used here. More cache on the new models doesn't make that much of a difference really, so the old $800 mashine would stand up, if just the graphics would be upgraded. Now his mashine sported an all new 8800gtx back then, but we could've gone with a 7950 back then and compared that to the 8800gt now. Anyhow, my $800 was more of a theoretical number than a real one. Just meant to say that synthetics are key for comparison between their build and ours.
As for your upgrade strategy - sounds sensible, but I've only started from scratch twice in my life. When going from my p200 to an athlon 1000 back in 2001 or so, and when I changed from my athlon 2100 to a northwood 2.8 - and I only started over because poor inhouse electrics had broken pretty much all hardware in the old one.