Koller may be a tad pricier than your average hardware store, but I will gladly pay more for the exceptional service they provide. I just moved in to a new place and I have been here 3 times in the last week. Every time I walk in someone is there to help. The guys there love showing me where things are located or offering advice on my many home improvement projects. They are solid and make me glad that I can support a local business over a major conglomerate (That's right Home Depot I 'm talking to you).
It is not the largest store, but they seem to carry everything I need. There is plenty of parking in the back and no one seems to know about it (well, until now that is).