After putting a hell of a lot of research into my system which I have just got installed recently with a DM800.
Dish = Fracarro Penta 85 (from High Definition LTD on Amazon)
Motor = Technomate (can't remember model, on Amazon)
LNB = Inverto Black Ultra (from some shop I googled, about 18 quid).
I'm getting about 85% SNR average on 28e, 19e and 13e here in Belfast and have no glitching issues with the HD channels which others are claiming. There are raving reviews about the LNB and the 85cm Penta is supposed to be one of the best in it's size (apparently behaves like a 1m dish, although i havent got a 1m dish to compare).
Heres a couple of pics of my setup to boot