Hawkins are fab if you can get hold of a secondhand pair although they dont seem to do zips up the back and are a mare to get on, fab when they are on tho for the skinnys amonst us!
I've got Regali Ricchi one's. Took me ages to find a pair to fit my legs as they are long and slim but these were great. They have a zip down the back too which is great as i get really bad cramp pulling boots off!
I had some Ariat gaiters and they were massive round the calf. Had so many problems when i was looking for long boots (we didnt have the biggest budget in the whole wide world, I will just have to keep dreaming of Sergios and others) and i also have size 6/7 feet. In the end i had to go for the Mountain horse Sportive ones, which although they are still abit big around the calf look ok because the tops seem to slightly curve inwards. Always nice to know that i am not the only stick in the world!
I had the same problem. The only mid price pair I could find were Shires long leather boots which do an extra slim fitting (I'm a size 7 too). They were £99.99 and look good & fit really well.