Saxon equileather ones, I ordered them in the last Robinsons sale but they were the wrong size but I was impressed with their quality. Can't find a link for the saxon to hand but found these on Robinsons that look pretty much the same as the Saxons http://www.robinsons-uk.com/products/search.asp?keyword=leather+gaiter
I had some from the english gaiter company. They fit really nicely and were £50 I think from Burghley but tack shops sell them too. http://www.english-gaiter.co.uk/
Mine are english gaiter company ones. They are lovely and were definitely less than £50. Be sure you buy the ones that just fit, not too large as they will stretch a bit and mould to your leg.
I used to have some Saddle Craft ones about 5 years ago - looked very smart, but not sure where you can get them now! They lasted about 3 years before the zips started to unzip on their own! I then got some Ariat gaiters which are a little more expensive - perhaps try ebay. They are very comfy and smart, I use these for hacking and schooling at home now as a have some Konig Favorites for competing!
Bought some from here a few weeks ago - mine were a different model with stretch inserts and more for everyday wear and I bought boots to match at the same time. Very nice quality.