I appreciate the lengthy reply! My question was out of genuine interest because there is virtually no bike infrastructure and very few commuting cyclists in my city. My biggest push for cycling is to keep city miles off my car and find a new perspective on things like my grocery commute (~3mi. RT). I've pretty much come to the conclusion that I can't bike to work, though, so it's hard finding a value rationalization for taking the plunge.

Never heard someone recommend an old mountain bike but it makes perfect sense. You've given me a lot to ponder.