Thinking of replacing my archaic athlon xp 1500 or whatever it is ive got which is almost 10 years old..

Would want to keep the case its in so anything atx size. Wouldnt mind having on-board Sata raid on the motherboard..

No idea whats current in processors but I guess anything quad core and then 2 or 4gb of ram..

What ballpark figure would I be looking at for something like that?

Ideas / prices please