I've heard mixed opinions about monoprice, but will I be fine if I am running a cable 10 feet? I'm trying to run 720p from PS3 and Dish receiver to stereo. Need to be able to run LPCM from PS3 for lossless audio. Will I be fine?

10' should not be a problem. The highest frequency rated cables are those with an HDMI category 2 rating so you might buy one of those to be on the safe side.

Should be. Key word: SHOULD be. Never certain.