Oh, I forgot to mention...
...I bought an Applause bowl back acoustic for about £100. It's really nice to play and although some people seem to have trouble playing it sitting down, I've not had a problem. The bloke I got it off was more than a little on the fat side, so his belly kept pushing it off his lap. Funny as hell to watch him trying to play it.
I'd definately advise you to try it first though, the sound isn't as full as a propper acoustic, but I still quite like it for thrashing around the front room on.