i reccomend dabs.com , especially on prices. one thing to note though is theyre not too clear about "expected dates", not much of a problem for existing products or if time not an issue, but when theyre waiting for a product not quite out yet the dates given are VERY subject to change... like my Creative GF3Ti200, took a month when originally expecting 2 weeks plus post time... in the end i got it before their email said it would (at least they DO give you regular email updates). It wasnt their fault (i still got mine before any other site said they had in stock) but its not quite clear just how preliminary some of the dates are. Nevertheless id still reccomend them.
also add Watford.co.uk (watford electronics - not used them tho)
Computer Shopper a good mag for finding these things out
[edit: oops someone got watford already

- shaggy u seen englands WC group?? could not have been any harder except swap sweden for germany, even then im not so sure!]