My favorite LQSs carry brights in oranges, yellows, etc. But, as pojo says, you'll get a wide range of likes & dislikes about colors. Other shops I've really liked are ones that have "sections" that accomodate Reproduction buffs, country, etc., in order to have something for everyone.
What is really hard to find, in fabric, even on line, is veggie-themed fabric; I've been looking lately for some and can only find 4 patterns or so. Also, Alex Anderson (Simply Quilts fame) stated once that polka dots can be hard to find.
last but not least, TOOLS and gadgets! For example, there's a pointer type tool called a Purple Thangy that I find invaluable when trying to catch the bobbin thread when I pull it to the top. I've only found two shops, one in Maine, the other in NH, that carry it -- very hard to find!
Best of luck with your shop! Good to hear new ones are coming along!