Thanks guys. I'm still unsure which to go for. I was leaning towards the Hitachi and it does seem to get most votes here. I've owned Quantum (remember them?) WD, Seagate, IBM (Hitachi) and Maxtor in the past. Of those, Quantum aren't made anymore and I won't buy another Maxtor. The WD was my fastest, Segate the quietest and the IBM the best all rounder.
Hmmm, decisions, decisions...