I like Milner and wouldn't mind him as a cheap utility player. Could take the place of Rosicky/Flamini and fill in a number of positions. I couldn't see regular games for him though and I imagine he would be a bit pricey for that sort of role.
Cech would be my dream signing. Still one of the top keepers in the world and should still be playing at a big club. But Mourinho wouldn't sell to Wenger and United are likely going to be in the market for a keeper this summer so I wouldn't get any hopes up on that front.