Unless you are wading in over a foot of water I don't think you can beat the comfort and versatility of good leather boots and canvas gaiters (neoprene is too noisy in heather and brush. Barbours are fine). The issued Army Pro-boots with Gore-Tex lining are £80 from Silvermans and really very good and you do not need to pay big name prices for comparable dryness, warmth, grip. Mine have stalked, shot and dog walked for the best part of 5 years and still have plenty of life in them. And they're British.