Know the shop well, it is my LBS. They are active locally, which is always a good thing. They have weekly road rides, a road race team and sponsor a popular Cross Race right in town. They carry a decent selection of mountain bikes from Jamis and Scott and will order whatever you need if they do not have it in the shop. In my experience they discount if and when possible and don't try to sell you stuff just to sell you stuff.
I do not often need service as I take care of that stuff myself, but on the odd occasion that I have needed something or have been in need of advice they have helped.