Favourites:

Daf DB250 (prefer the Voith Gearbox)
Man/Alx300 (the older ones)
MCW Metrobus
Plaxton Prestiege
The Ex London East Lancs bodied Volvo B7's GNE has (would like them even more if they weren't dual doored)
Scania Omnicity
Dennis Dart SPD
Dennis Lance

Dislike:

Volvo B10BLE
Mercedes Citaro
Enviro 400
Volvo B5 Hybrid
Volvo B9TL
Optare Solo