The action on an acoustic is generally regarded as being higher than an electric, although I did play one at a bash once which had incredibly low action. It all depends on the neck relief / quality and how low you want the action to go. It is down to personal preference and playing style.
Because it will involve reducing the saddle height (assuming it's a plastic saddle), just take it down a little bit at a time, until you reach a height which suits your preference. Similarly with the nut, just take it down a fraction at a time until your happy with the action.
Whilst the neck may be straight, the join to the body may not, which could give a higher action than expected. Provided there is plenty of saddle height to play with, it's worth lowering the height by filing, although I would recommend getting a second saddle to experiment with and keep the old one just in case.