For frame of reference, you can expect to pay double for a comparable quality mandolin as you would a guitar. Carved arch tops are hard to make. That being said, there are deals to be had.
I would personally recommend getting a flattop mandolin (especially if you aren't into bluegrass). Big Muddy makes great examples of what I am talking about and that is what I started on.
http://www.bigmuddymandolin.com/store/
I am looking to sell mine because I upgraded, PM me if you are interested.
Other than that, Kentucky, Eastman and Loar mandolins are the go-to starters. They all make decent instruments made in china. You get more tone for the dollar in the Flattops in my opinion until you get to the $1000+ price bracket. If your direction isn't bluegrass, I would say to google the G, D and C open chords and get out and try some flattops.