You'd get a stonking Golf GT TDi for that money, with change. I don't think you'd get a MK5 GT TDi, but could be wrong. Sling a remap on them and while they're not as fast as most people make out, they're still punchy as hell and return good MPG.
Alternatively, sell everything you've got, buy the FRS you really want and get a cheap smoker to rip around in to work/leave in town etc.
Cheers,
Grant