To my mind, Acoustic is Acoustic.... A/E guitars should sound as good un-plugged as amplified.
BUT, when you are shopping and have a budget, find the best sounding guitar you can in your price range and don't let the lack of a pickup dissuade you from the purchase. Some time down the road it is possible to install a pup without breaking the bank. My personal favorite is K&K Sound's Pure Mini at around $125 US. Put a set in a Taylor and it sounds as good or better than the Factory Installed option at considerably less cost.
As usual I am also going to stress that you put your own paws on as many as you can, and play all the candidates. Sometimes you will find a real sweet sounding instrument that fits you well without spending as much as you planned. So shop around!
Take Care;
Doug
"what is this quintessence of dust?" - Shakespeare