[shraken]

There are many system on module (SOM) vendors in the market. Many of these SoM's have limited market so they're not going to compete on price.

I've used DAVE modules in the past, PHYTEC also makes some great modules for different Silicon vendors: http://phytec.com/products/system-on-modules/

Good break-down here: http://elinux.org/Computer-on-Module