I've used Blackvaar's guide before and it's an excellent place to work from if you want canon or near-canon uniforms.
Recently however, I've found myself using the "Common Starfleet" option of Sierra 1 jacket and long trousers. Shoulders in branch colours, A6 for Tactical and so on with a basic black for the bulk of the uniform.
Combadge and Rank pips are usually silver, as I dislike the way the gold pips look with this current pallete.
I've seen other crews use similar uniforms, and rather like the idea of matching a number of other units.