Christian vs. Edge is of course a dream, perhaps we can get it in for Wrestlemania? I'd have Edge & Christian team up to eliminate a lot of people in the Royal Rumble, then have Christian eliminate Edge, only to have him screw Christian over when it looks like he's going to be one of the last two people in the Rumble.
I don't really see Miz & Jericho as a feud, as neither would be suited to be a face. They'd make a good tag team definitely, and could have a lot of feuds with people, such as Morrison & R-Truth.
If I had to choose a singles feud for Miz, I'd have him feud with Cena, and hopefully put him over Cena legitimately. With their history and Miz's promo skills, if Miz got put over Cena, he could draw in an ungodly amount of heat.
They've already done it and failed, but Orton vs. Edge could be good if done right, which is code for lots of hardcore wrestling.
Jericho vs. Anybody, as Jericho can make anybody look good.