I'm debating purchasing some PAR EA or PAR MCM along with some PARnel's to replace our old and inefficient 6" and 8" fresnels. Want to know a couple of things before I make my decision. -Is the only difference between the EA and the MCM that the MCM has a metal cold mirror and is only rated to 575watts while the EA is rated to 750watts or is there a throw/focus difference also? -How do PARnels's compare to regular fresnels? Is the throw relatively the same? How's the beam spread? Are they worth the money or would it be a better investment to buy new fresnels. -The primary use for these fixtures are for top lighting and side lighting, which fixture is better at which? Or is there one fixture that can serve all my needs? -What's your personal experience with these fixtures? Do you like them? Are they easy to focus? Are they easy to repair? Thanks!