I used a gig bag for ages before I bought hard cases for my guitars. (I've still got it.) It's much easier to walk with, as all the weight's on your shoulder, not at the end of your arm. Nowhere near as good protection, though. And the strap fastener squeaks! It drove me barmy (although RtS will tell you I was barmy to begin with). I'd say if you were going to get a hard case, get the best you can afford. I've got a Hiscox for my 12-string -- they say you can jump on them, but I haven't put it to the test! -- but a cheap Chinese job for my other one, and the difference in quality is very noticeable. If you're a few bob short just now, hang on a bit longer and save up: it's worth it if you take your guitar out.