Good idea. I like to look through www.beprepared.com, the emergency kits. I haven't purchased from them or anything (yet), but you can get a good idea, also, they have some good sale prices sometimes.
I can personally recommend this guy. He'll sell you a kit, sure, but what he has to say is perhaps even more important.
It's also cheaper to make your own kit.
http://www.equipped.com/