Something that I thought would do well was a 'Fellowship Battle Pack'. The reason I want this to be a set is because it is very pricey to get all the sets for all of the fellowship. So this is mainly for people who don't have enough money to buy all of them.
There are 9 minifigures, all of whom are in the Fellowship. They are:
Gandalf the Grey - comes with sword and staff,
Aragorn - comes with sword,
Gimli - comes with battle axe and throwing axe,
Legolas - comes with bow,
Boromir - comes with sword and shield,
Frodo - comes with Sting and The One Ring,
Sam - comes with Hobbit sword,
Pippin - comes with Hobbit sword,
Merry - comes with Hobbit sword.
The set would have 60 pieces.
One thing I was considering was whether to add Gandalf the White to the set, as he is yet to appear in the Lego Lord of the Rings theme. This would put the cost up a bit. I might add Bill the Pony, and a little scenery too.
I hope you agree with my idea and please get voting!