this is the way I see it. (there are about 10 shops here in vegas) and I would go to the shop that has the most knowledgable and helpful crew.
One interesting thing I find is that the better shops have people that ride a lot working at them... for example I met up with a mtb group a few weeks ago, there were two guys from the same shop riding with us. they were really nice and even gave me some advice (even though I didn't pester them) about different aspects of my bike. These people (the ones who really love what they do) are the people I go to, they know what it is like and will treat you well.
so in retrospect support the shops that you like, if the LBS doesn't cut it, then take your business elsewhere.
p.s. I like your pearl jam sig