There will be a wide variety of cars that fit the criteria that you have set, most Jap turbo's.
However the maintenance costs is where it will kill you, so you're whole plan of "cheap ish" is flawed. If you were to compromise on 1 or 2 areas there are even greater variety of cars that will satisfy your needs. An ST220 is one for example, Should be able to get one for £3k, won't have 220bhp, but is able to, and certainly won't average 30mpg, but could maybe manage it on a run.
Arguably slightly more reliable, and part will be slightly cheaper than other suggestions so far.