Buy right or buy twice.

Do a little research on which products have a great reputation for being comfortable and durable. Don't underestimate looks either. I'd much rather buy a pair of $100 bibs that will last and look good on me rather than a pair of $40 dollar bibs with a crazy design and obnoxious branding.

That being said, Performance bibs are cheap, decent, and have an understated style. For a little more money, I'd go for Giordana Silverline bibs.