You could also try KOTE as well as UK Garrison.
Knights Of The Empire
After lots of research I'm just in the process of getting TrooperMaster armour, who I've heard nothing but great things about. Plus it's from the UK.
I went to a Memorabilia recently and saw some guys in good FX armour with modified lids and to be honest they looked fantastic and my untrained eye couldn't really see anything wrong with it.
The people in the clubs are a great help, but don't post a thread saying 'where do I buy armour?' because it is against the rules.