I've only bought recording equipment from Carlton Music Swap Shop but I would trust the guys at The Acoustic Centre when it comes to acoustic guitars. They can also do a set up for you and get the thing as playable as possible, It's a nice place to just go and hang out.
Dollar for dollar though, second hand is where it's at.
Picked up an '73 cherry red strat for the old man - sounds amazing - some minor cosmetic flaws (finish has worn away in some spots) - $1600.
Got given a '89 strat for my 21st. Would have sworn it was brand new. NFI on cost, but it wouldn't have been stupidly priced.
Bought my fiancee a Yamaha '71 FG-300 for xmas two years back. Holy shit balls, it makes such an amazing sound. Perfect nick, too. That was very reasonable - and would blow any new, similarly priced acoustic out the water.