I like Mourinho as the next manager. It'll be hard for anyone to replace Fergie, but if you are going to do it you might as well go big with Jose. He is looking for a new team, has had more than enough success to warrant it and it would be a nice way of sticking it to Abramavich too.
Moyes has been great with Everton, but he hasn't had to deal with that same kind of pressure he would get if he came to ManU so I don't know if its the best choice. Moyes will always be trying to catch up to Fergie's name (a fellow Scotsman), but Mourinho has already built his own legacy so it seems like a better fit.
That being said he has done so well on a tight budget there maybe he could really make the most of ManU's bankroll.