I have the Brogini Stretch Gaiters & love them! Can't remember where I bought them but definately paid under £30, if you google them they should come up. I like that the material's not too thick, feel like I can properly feel my horse when I'm riding, if that makes sense! Plus they look like long boots
I also will be needing some new boots soon, so will be interested to read recommendations
Tuffa gaitors are good, I have a pair! I think there are two types, both will be worth looking at, they look smart too! If you dont mind spending somemoney, ariat are probally the best, they are VERY nice