I recently got a new set of business cards printed over at GotPrint.com. I chose their most basic features (glossy, 2 sided color) and I am impressed by the results. I ordered about 750 and with 2-day shipping it was less than $50. I think they have very decent prices, a quick turnaround and thick, sturdy cards.
I also designed mine with a white text on a black background, which is hard to print correctly because of smudging. The reason Got Print impressed me so much is because there are no smudges and everything is clear.

Good luck on your search. Hope this helps.

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Alicia Granda | A Grand Assistant | Virtual Assistance for Professional Individuals | AGrandAssistant.com