Monoprice, has some cheap hdmi extenders but the un powered versions are more picky about the voltage output from the source device, as they are powered by the 5v on the hdmi.
http://www.monoprice.com/products/p...=10425&cs_id=1042501&p_id=6177&seq=1&format=2
I've had these work with a PC as the source pretty well over about 50ft of cat5e without and amplification. They are supposed to work much better if they are behind an active (powered) hdmi switch or splitter. I haven't given that a shot with the splitter yet, but these have failed to sync a picture with denon and samsung bluray players as the source device both directly to a TV and through a receiver. But at 20$ for the pair they are a steal if you can get them working properly. They aren't 1.3 compatible but meh... 7.1 lpcm is fine with me.
Geffen, Niles, key digital, just to name a few, make the higher end hdmi over twisted pair devices but they can be quite expensive.
But, with HDbaseT these are going to be obsolete entirely...
Glad I could be of help. It's a lot of work, but you will have a better understanding of what's in your walls and the distribution system. And, you should save yourself some money, or wind up with a much better wired house than you would have otherwise.
Don't for get to buy junction boxes, and if you home has a vapor barrier make sure to get vapor proof boxes for exterior walls!