To say what is a good acoustic is like saying how long is a piece of string! I have had a go on a couple of Matons and they are nice however I picked up a Martin HD-18 that was 20yrs old with crappy strings and it sounded superb! and felt right, however the £1700 price tag reflects this!
I feel that Matons are just a little thin sounding for me but thats a very personal thing,however when plugged into PA thats a whole different matter they have fab electrics on-board and sound Beautiful, I do now own a Martin HD-35 and its just perfect! but to your question I would indeed go to a shop try all kind of models out, Yamaha have some very good affordable guitars and pick one that feels right for you, also depending on how serious you are about this I would defo get the guitar 'setup' properly (intonation string height ect)the shop should be able to put you in touch with someone who does this and it would feel like a real dream to play..just my two cents