does anyone have a killer opeing system. I use Nf3 c4 and e3. ECO says e3 is interesting. I figured it couldnt hurt to ask.

Depends on who you're paired against, and what they know, {usually, one of those *"known unknowns"; Plus an alleged 'Fischer' quote, I didn't know about {see next paragraph}, supercedes, in the 'long run'; Merely choosing to play one opening vs. another.
 
This is presumably, initially based, on a fair amount of experimentation; Including, your own 'changing tastes'..{to keep from getting BORED!}. {*'known unknown': Google, Donald Rumsfeld quotes, for the full quote}.
 
Chess Quote of the Day
 
"Your body has to be in top condition. Your chess deteriorates as your body does. You can't separate body from mind." - R. Fischer/courtesy of: http://www.chessvideos.tv