As a lefty this thread is right up my alley. I'm a Marine so anual rifle quals are required. If the Marine Corps issued left-handed M16's today, I'd jump on the band wagon. When it comes to reloading in a hurry but keeping your natural point of aim, it would be so nice. However, I don't get issued a left-handed rifle, so I don't want to be fumbling around on the wrong side of my weapon when I need it because of civilian plinking habbits. All of that aside, if you're just using it for plinking, get a right handed. They're more common and please correct me if I'm wrong, but they're a little cheaper.
It doesn't matter what you get, broseph, just become proficent with it and it will be like an extension to your own body.