GuitarGuitar stock great stuff for sure, but good lord the guys in the stores get on my nerves. The older guys that all came from Soundcontrol are good guys, but they only seem to take on ultra-gear-geeks with zero social skills now :? It's like shopping at a Warcraft Convention. There's also an awful lot of guys trying to bluff stuff, I'd much rather they'd just say "I don't know, lets go have a look on their website".
In Glasgow, if I'm after something I can't source through my own work or direct from a company at trade price, I always shop at CC Music in the West End.