That'll be their undoing as far as I'm concerned. I went with City last season and I'll do the same for this one, decent manager or not for United they're still a crap squad that one or two signings won't fix, and Rooney signed his latest contract an entire four months ago so expect him to throw his toys out of the pram and stir up transfer rumours for January until he gets his 500k a week deal.
I think Chelsea will provide the big challenge this year with the acquisition of Costa and Fabregas, and Liverpool again although I don't think they'll be as good as last season.
Leicester is an interesting one, the owner is willing to spend £180 million over the next three seasons to get the club into the top 5, and apparently they've got something like £40 million to spend this summer. I just hope they don't do a QPR and buy players only there for the big payday, but that is unfortunately the only way to get half-decent players playing for low-level teams. Should be good to see who they're linked with in the coming few weeks though.