You have a few options. I think a 3/4 sized acoustic would be best. Here are some links to some other portable guitars.

http://larkinthemorning.com/product.asp?pn=GUI122&The+Wayfarer+Portable+Guitar=&bhcd2=1169620641

http://www.musiciansfriend.com/product/Traveler-Traveler-Pro-Travel-Guitar?sku=518700

http://www.amazon.com/6-String-Travel-Guitar-Sunlike/dp/B000B9EHFO

these are all "travel" guitars so they are easily moved around. they do look a bit funny though. If it's just something to practice with for now I don't see why not.