I would suggest finding someone who plays guitar to help you pick one out and go to pawn shops and buy a used one. I agree an acoustic 6-string is the way to go. A few of my favorite less-expensive acoustic guitar brands are Takamine, Ibanez, Fender, and Epiphone. Washburn looks good but I never had one. Another brand that is pretty cheap is Rogue but I think the quality is pretty low.... but for a first guitar maybe OK.

Usually you will get a better guitar and cheaper price buying a used one, but you need to bring someone along who can help you choose a decent one. I dont think you need to spend more than $300-350 for a good used or new one, and probably not less than $180-200.

If you have to buy a new one shop around, go to a place like guitar center and try some out - again bring someone with you that has played guitar for a few years. If you find a brand and model you really like you might try a mail order place like muscians friend or AMS.