I just bought the Lite-On 8x +/- DVD-R/RW from PC World and maybe I could have got it cheaper elsewhere BUT it was there, I had the money and I didn't want to wait for postage etc. only done cds because I only fitted it yesterday. Seems good to me though.
Pioneer are good I believe too.
Heard one or two stories about Sony the put me off a bit. BUT then Sony have a good reputation sooooo......