I agree with Lighting Boy that there are a great many second hand guitars out there which sound great and might have a slightly bowed neck making them difficult to play for the beginer market for which they were intended. I have an old Yamaha (I mentioned on another thread) which has a slightly bowed neck (it can't be corrected with the truss rod). I think it sounds quite good but is not worth what it would cost to have the bow removed (I need to ask about this process in another thread, BTW).
I use this guitar for alternate tunnings and mainly
slide. I like it enough that I didn't NEED to buy that Regal (even though I'd love a netal body reso guitar for slide). Look around in some pawn shops and music stores to see what you can find in the $100 to $200 range before you drop $500 on a Regal or similar.
John