Just because you use one grain, you can use more than one hop. I prefer a bittering hop and a complimentary flavor and aroma hop.
Magnum for bittering
NB, Amarillo, Simcoe, Columbus, Centennial, Chinook, Mt. Hood, etc.
I just gave you 8 different beers if you hop the same. Change that variable and you have hundreds more. And for God's Sake, don't mix the hops.