I have my system setup with 2 HDMI cables 1 from Dish network box other from PS3 into the HDMI inputs. 1 HDMI cable from receiver to the tv. The problem I have is all the extra sounds (i.e. music, sound fx) over power the voices because i need to turn it up so loud to hear whats being said. Any suggestion on how to fix this would be much appreciated.

Um,okay,
first thing first. Make sure all your speakers are at ear level. And have you calibrated your speakers with a sound pressure meter (spl) 'If not i suggest you to get one from radio shack,their only 50 bucks analog or digital be fine.
Second please take a look at dolby speaker placement guide. http://www.dolby.com/consumer/home_entertainment/roomlayout.html

Third,there should be a setting on your receiver call drc,that will lower your sound effects and bump the dialog.