I'm wondering what would be a good multi effect unit. I own a Digitech BP200 and its fun for a little inspiration but it really sucks for real life use. It seems to distort my sound at higher volumes and some of the effects are a little cheapy sounding. (not nearly as bad as Zoom) If I were to buy a rack mount unit or somthing along those lines what should I consider. price range under $600 but all suggestions greatly appreciated.