I'm looking for a set of speakers to "hide" in our new entertainment center pictured here:

http://bdifurniture.com/theater/graphics/cabinets/product_images/avion_8528.jpg

We're trying to keep things as uncluttered looking as possible so the speakers will be going in the top drawer which has speaker cloth across the front. As much as I'd like to, we're not doing surround sound. So, should I be looking at a set of speakers, a sound bar, or what? Any suggestions?

I'd go with a sound bar. I PM'd you some options since you didn't specify a price range.