When you get to the final battle, how many factions (Khans, Boomers, etc) should you try to have in order to make your victory as easy as possible? I've been trying to line up as many as I can from the side quests, but then I wondered if you could get by with one or two?

If this is in the wrong forum, I apologize but I thought I'd ask here first.

You can get by with zero. I had one allied faction and it was like 2 guys who showed up and died before they even did anything.

Screw it get them all I say. I'm taking the same approach.

Securitrons Mk II are pretty much all you need if you do House/Independent Vegas.

If you can get them, and they don't bug out, having 4 Enclave Remnants with you to battle the Legate is excellent as they are extraordinarily strong.