I have question regarding how to play the end of FNV? How do I avoid Yes Man, destroy the bunker and Mr. House: Put the legion to death and send the NCR back to New California? And, what would be the outcome?

dont talk to yes man. Talk to Ceaser to get the bomb to blow the bunker, kill house, kill Ceaser, kill president Kimball and in the process kill Legion and NCR troops. my guess is it would be somewhere along the line of helping yesman since you do a lot of this stuff anyway

Yes man is the default I thought if you didn't want to join anyone else. Yes Man does your bidding and your bidding only. He is your Yes Man.

It's my understanding from using Yes Man before that from what he says about upgrading himself at the end, it makes you wonder if he is trying to take control. Moreover, for Veronica's sake I want to leave the Brotherhood alone. The Khans are now on the move Eastward. The Boomers are in my pocket as well. I guess what I am looking for is the best of all possible endings. For example, I was rather disappointed in my character dying in Fallout 3, for the good of the people. And, I suppose the Courier walking down the railroad tracks during the cut scene, at the end is what it is: Walking off down that lonesome road into the sunset, I guess that is as good as it gets.