Alright, so far I've killed Benny, talked to all the tribes, I've just went into the Legions underground base thing and have placed the Platinum Chip into that computer thing meaning Mr House's robots are even more improved. So now I have to go back to Mr House and talk to him. Please don't spoil the storyline for me further, but am I far from completing it? I am loving it so far.

bump

I am about where you are and I would say that is around half way. Can be hard to say for sure with all the side quests and such.