DUI - have a good track record and are very warm. A few people have had issues with the sizing of them (ask Alastair) and they tend to be on the pricey side.
Polar Bears - A good suit (I use one) but for a MTM they seem to be a bit large on the sizing. Warm and good quality suits otherwise, the pricing is around the £200 mark depending on whether you are stock or not.
http://store.polarbears.co.uk/index....9cb76d83aab7c8
Santi - This is a relatively new suit but said to be good. Good pricing (£170 MTM including delivery I think) but you need to sort it out with Marcin on the board (as they come from Poland). Jen Cowling uses one and likes it a lot. IIRC it has stretchy panels to give better movement when wearing the suit.
Hope to help.