I'm looking at buying a new computer that will have somewhat more than 'the bare necessities of life'

(up to £1600ish). A processor speed of 3000 seems the best compromise and an AMD Athlon will enable more goodies in other areas than a Pentium.
Now, I've found out what what Barton Core and Hyperthreading mean (well, sort of) but whenever I look at the various company websites, most of them mention the Athlon with 'Quantispeed' Is that the same as having a Barton Core ???

When I spoke to Mesh (I'm seriously considering the extreme 3000+), they said it was - but I wasn't sure that the person I was talking to had any more knowledge than myself!
If anyone can recommend a system (a good 17/18" TFT screen is the main priority) that is a good fast all-rounder, please feel free
Cheers!