Besides the set linked above, you could choose any wheels from Retrogression and not go wrong. Also, anything in the $200-300 range from Velomine will be decent, certainly an improvement over what probably came on your Pure Fix.

Good brands of rims include H+ Son, Velocity, and Mavic. All City hubs are a solid value, but might be just out of your price range. For a really low price, Origin8 hubs are not bad.