Wigan is the team I watch the most after United in the EPL, and from I seen from Insomnia in his Wigan days, that an on form is better than an on form Wigan's Valencia. Valencia improved so much when he moved to a bigger club and I can see N'Zogbia flourishing with a better club.
They are also better options than Bastos and I read that Chelsea wants to get rid of them (alongside with Drogba, Bosingwa and Mikel). They would be cheaper than Michel, too.