nexus-s with CI, onboard MPEG decoder and video out. NOVA, is the cheaper alternative without CI, no video out, and uses your CPU cycle. unfortunately, skystar1 is not in production anymore.
if you factor in the actual cost of the product PLUS shipping and taxes, you will be paying more if you buy online. add to that the risk of paying online too. whereas, if you buy locally, you can always return the merchandise or complain directly if something goes wrong with the hardware.
just get skystar2 if you have ample power on your cpu. cheaper too. but if you have the money, then get what your budget allows you.