Go for the Â£20 Philips. It'll either be a SPD2400 (LIteon 1635) or a 1660P1 (Benq 1650). It's a simple cross flash to the Litey or Benq & for Â£20 well worth the money. You won't get a better burner any cheaper.
Call SVP first to confirm that it is 1 of these I've mentioned.
Alternatively PC World are selling the Benq 1650 for Â£35. Must be one of them near.