I had Legendary pre-ordered, but last week I changed it to just the Limited Edition. I didn't think it was worth the extra $60-70 for the replica helmet, bonus art work, and dvd holder. It's cool but I don't have the space to put that stuff and it'd end up being junk / clutter and collect dust sooooo I went with Limited instead.
Definitely psyched about the game though, both for the story and multiplayer :rocks: Didn't play the beta, saw a couple of game videos though, it should be great.
I'm also considering Halo Wars in December. I just downloaded the game demo (non-playable) on XBL and it looks like fun, if you're into Command and Conquer / strategy