Re the Premier inn at Heald Green, the railway is right next door its only one stop from the airport and costs less than £1.
Also dont forget the new travelodge at the cargo centre, book early enough and you might get one of their £29 deals.
Or if you really want some atmosphere try and get one of the rooms upstairs at the Airport Hotel Public house on the old ringway road, it overlooks the end of 23R, its very cheap but a bit noisy !!!!!!