I'm a roadie for 95% of my riding so I tend to lean towards bibs and a jersey.
If you're looking for something that's inexpensive, Performance and Nashbar house brands tend to be great value. I've got two pairs of Performance shorts that I wear under normal clothes for commuting and when my "nice roadie kits" are dirty.
The best chamois I've ridden on are the DeSoto "400 mile bibs" with 14mm Ceramico chamois (it was a "reward purchase" for hitting 2500 miles last summer…40% off helped offset the price tag). If you're willing to spend big I don't you'll be hard pressed to find something nicer.
The Pearl Izumi's that Doug mentioned are good too.