I bought a 2002-ish Trek 520 used just over a year ago and use it for commuting and grocery shopping. I had to do some tweaking to get it comfortable (mostly undoing what the original owner had done to the poor thing; when I bought it, it had a heavily-padded saddle that became unbearable after about a mile, plastic pedals, and a too-short adjustable stem), then put on Freddy Fenders and a mudflap cut from a milk jug. A little while after that, I scored a pair of Continental Top Touring 2000's cheap on Craigslist for it. Other than that, it's still stock.

It's a great ride.