I would rather grill steaks, but we can't do that all the time. I also much prefer charcoal over gas, but I do own a gas grill just in case we run out of charcoal.
I do like the 80/20 Angus mix, then we always mix in a little bit of re-hydrated onions (About 1 tablespoon per pound), pat out 1/3 pound patties, then cook just about like a steak. Hit it with high heat to sear and seal juices in somewhat, flip and sear the other side, then move them over to a less hot area and cook those bad boys.
My wife always has to have her meat well done, I'm a medium done guy and I don't like squeezing them down with the spatula or anything while they're cooking, so I've got a digital thermometer so that I don't overcook mine. (To me, well done is well done and you can't overcook it, so I'm not too worried about her burgers).
I also don't put any salt on the burgers until they've cooked. I read that salt will draw the moisture out of the meat and tends to make it a little tougher, and from what I've seen, they do taste juicer and better this way.
Just before I take the burgers off the grill, I do sprinkle some Texas Road House Sirloin Seasoning on them and let them set for just 30 seconds or so. Put them on a plate and cover with some foil to let them settle down for four or five minutes, then dress them out and go to town.
We've also mixed in an egg (not too bad), jalapeno peppers (also not bad, but I prefer just putting slices on the burger) and I've tried the sausage mix, but if I'm going to eat hamburger, I want hamburger, if I want sausage, I'll fix sausage, that's just my thing.
Another thing I like for my burgers is bakery fresh buns, not the bagged ones at the store. We're lucky enough to have a bakery here and their buns make a world of difference in the way a good grilled hamburger tastes.
Years ago I used to do a lot of traveling across the country and ran into a little truckstop down in Tennessee that sold cheeseburgers with a fried egg on them. The waitress told me to try it and if I didn't like it, I could take the egg off and she wouldn't charge me for it. I did try it and stopped in there every time I drove by, it turned out to be one of those weird, but very good, sandwiches.
If you like Spam, it's also great cooked on the grill, makes for a good fast lunch