Originally Posted by
ThermionicScott
If the chainguard isn't a hard requirement, there are lots of cheap 80s/90s mountain bikes out there that would do the job, too. Upright-ish position, room to add inexpensive plastic fenders, eyelets for racks, etc. In a big market like Atlanta, you'll have lots of crap to wade through on Craigslist, but I saw a couple.
They have chainguards that work with rear derailleur equipped bikes. They're not full chainguards, but the do protect your pants from the chainrings.
There should be TONS of bikes in atlanta that would fit your requirements...