I've never had a bad meal at Po; I tend to stick with the pastas.
Dishes I have particularly enjoyed on their regular menu include the orecchiette with broccoli rabe in a sausage ragu, and the black fettucine with mussels.
Have never done the tasting menu but the price is certainly right (about $50, no?) and I hear good things. Like most restaurants, they'll only do the tasting menu if everyone at the table orders it, which is why we haven't done it so far.