Froggy, I have to pretty much second what orangat is saying: there's a Leadtek GeForce 7600 GT 256MB GDDR3 HDTV/DVI (AGP) - Retail (GX-088-LT) for £123.32 Including VAT at Overclockers UK. It's available now, fits your existing machine, offers many new features, is a simple upgrade, doesn't cost a fortune, and will future-proof your current hardware as much as possible without a complete overhaul. It or something similar should do you great for now.

In a year or two, you can reevaluate your requirements based on what you're playing then, and opt (or not) to go for a new hi-zoot machine. I wouldn't worry about DirectX 10 right now, as it isn't available and will probably require a transition to Vista. Rumor has it that Microsloth plans to built DX10 into Vista, but not offer it as an upgrade for WinXP (boo!). At any rate, I don't recommend planning purchases on announced, but unavailble, features - or staying too close to the bleeding edge of technology. That way lies madness, as there's always something better 90 days after you buy the latest new thing.

And don't fret the technicalities - you've lots of .org friends who'll willingly volunteer the best advice for their favorite Froggy!