Carl in Bikelove is great for repairs and getting stuff to order.
Stu, Jon and the guys in Alpine are also very knowledgable though their workshop struggles a bit to keep up with the high level of demand. They are a bit of a victim of their own success meaning you have to book repairs and services well in advance depending on how busy they are.
Big Al at Wheelcraft in Clachan of Campsie is a legend and definitely worth visiting.
I’ve also heard good reports about Willie Bain. He seems a really nice guy.
Mark and Dave at Solid Rock in Balmore deserve a mention. Excellend stock and nice folk to boot.
George in West End Cycles would also be pretty handy for you and Gear is close by too.
Hope this helps?