i like gaslight if you can get there on the earlier side before it gets too packed and loud - nice couches and reasonably-priced drinks. it's on 14th, west of crispo - around 9th, i think (across the cobbled street).
The Otherroom in the West Village (Perry St between Greenwich and Washington) is the perfect spot for a drink or two. It is my favorite bar in the area and everyone I take there loves it too! Cash only.