I'd try pick somewhere out towards the East to live, into Lincolnshire if needs be, as you *may* get better value for money.
Many of the area's around Doncaster were/are run down after most of the pits closed down, so although cheap, might not be what you want. Things are getting a lot better though !!!!
Depends on what kind of life you want really, if your happy to live in a small town/village, and will drive into Doncaster to visit Tesco's once a week kinda thing, then go for Epworth or somewhere like that.
If you want to be out on the lash in Doncaster every Friday and Saturday night, then you might want to live closer in.