Jamie
The Demons are the best hardy rods i've tried to date, the new Diawa signature rods are really good too if you are after 10fter
The 5 wt was particularly impressive and for stillwater water fishing in this part of the world everything you could ever want.
If you visit places where you need a Hi-d line then perhaps a 7wt is a good thing, mine is for salmon.
I've heard good things about the Scierras too but have not cast one (unlike the demon and signature)
I would talk to diverdave to see about getting to try the Scotts, the 'A' series is a great range as Mike says especially the 9ft 5wt one.
If at all possible try a few rods first if you are spending a few quid, its well worth it, the better shops should accomodate you.
And i would suggest trying some of the lighter weight rods, its much more fun
Sandy