I'll have to agree with SCMustardman's choice of seasoning. I, too, enjoy Weber's Gourmet Burger Seasoning. I use it on burgers and steaks all the time. I enjoy a little worcestershire sauce it there as well.
Started with a 1.37 lb Top Sirloin Steak and cut it into strips.
Grinded it with the fine disk in the KitchenAide and then added Weber's Gourmet Burger Seasoning and Worcestershire Sauce.
Formed it into 4 equal patties, all of which were about 1/3 lb. I don't like my burgers too thick, as I like to add all sorts of toppings. That way you don't break your jaw.
Then into the fridge they went. Stayed in there and chilled for around 35 minutes. I do this so that way they don't fall apart on the grill. Then onto the grill they went.
The wife is a self-proclaimed "simple girl", so she went with the American Cheese. I'm a "complicated" sort of guy, I admit.

So I went with freshly grated Romano Cheese on mine.
Had these marninating for awhile beforehand. Tomatoes and Onions marinating in Seasoned Rice Wine Vinegar. Wow, I love me some Seasoned Rice Wine Vinegar.
The wife didn't use all the "fancy stuff" on her burger, but on the bottom bun of my burger, I started with a thin layer of Mayo, then some Jalapeno Mustard, some Marinated Onions, some Dill Pickles, some Sliced Roasted Red Bell Pepper, then the Burger with Romano Cheese. On the top bun was another layer of Mayo and Jalapeno Mustard, and placed my Marinated Tomato on top of the patty.
Served with "SCMustardman Fries" that the wife made.

I also included the pic of the Jalapeno Mustard used, as well as the Seasoned Rice Wine Vinegar I used to marinate the tomatoes and onions. The Jalapeno Mustard is GREAT on dogs and burgers.
Bon Appetit !!!