whiskey,
i would say weigh it out, as mentioned for around 120$ you can go to an nforce 2 / xp1700+ combo which will run circles around your current rig, and it will overclock with good memory.
i would think in your case it would be a great way to go, and again you can sell the celeron mobo combo to someone, even at a loss to offset the 120$ upgrade would be worth it.
breaking even on the dollars but getting 3 times the platform.
and tombits,
you said, "To justify my choice of AMD:
P4 3.0 800FSB Retail - £362.46
Asus P4C800 non deluxe - £148.69
Total - £511.15 including VAT or about $760"
but you can get the springdale board and a 2.4 intel p4 usa anyway for $300 together, i know cause i ordered them both yesterday.
and they will perform close to the new canterwood you priced and will smoke any nforce2 amd combo that im aware of to date anyway.
barton 3200+ = $535.00
nforce 2 asus board about $100
thats over $600 for a system that wont compete with the springdale setup which cost half as much, so think it over.
yes in past dollar for performance amd all the way.
in light of the recent findings with hyperthreaded 800 fsb springdale motherboards an ht chips in the 120$ range puts intel in the game in a big way for best bange for the buck.
i ordered a raptor hd, 512 of pc 3200 and the asus p4p and 2.4 cpu all for around $700, the whole rig is almost as much as just the xp3200+ with mobo.
so i say the opposite , why spend more money for less performance, yes you can spend less and get less if thats what you want, but performance vs dollars.......