There is a lot of factors that go into deciding what kind of acoustic guitar to buy. The biggest one would be what type of wood it is made from. The wood will affect the sound qualities. So it just depends on what type of sound you want and music you play. http://www.sweetwater.com/shop/guitars/acoustic/buying-guide.php
Bro...takamine! Anything in the EG series. They have awesome sounding acoustics as well as acoustic/electrics that only get better over time. I also prefer their 12 string guitars over any other I've played. Give it a shot.
My favourite acoustic guitars are ovations, Reasonably priced and best sounding Not to put down yamahas or washburns or especially takamines but I own a 1970's ovation legend and if they still make them like that, It's worth the $700