Nordstrom always has a pretty good selection. I've picked up a few pairs of Ralph Lauren and been happy with them. The more colors you have the better you can match them with outfits and because you spread out their uses they'll last some time..
The best selection I've seen anywhere. Paul Stuart is sock heaven! Just pass the checkout stand and let your eyes wander right ... the colors will knock your socks off ... which I suppose is the intention.