As far as I can see, you're down to 4 cars that are "similar" spec'd:
- Audi A3
- Golf GTD
- Skoda Octavia vRS
- Seat Leon FR
They are all similar as they are all built around the same chassis/engine and are built to the respective marques price points. IMHO, the A3 is the best of the bunch in the cabin and also to look at, but is also the most pricey. I'd go and sit in all 4 before making your decision (I've done this in the past 2 weeks) ergonomically and then test drive any you feel fit. Of the 4, I have driven an Audi 184 quattro and Skoda vRS (although the petrol engined version). Given I don't fit in the cabin of the Golf and find the Leon too much of a squeeze, my preference would be Audi, Seat (in terms of trim, not driven it), Skoda and then fit the Golf in where you feel it is right - I'm unable to form an opinion as I can't get in it!
I've also driven a Mini Countryman 1.9D in the last couple of weeks (and a Kia Ceed!). Whilst the Mini is surprisingly large inside (I'm 6' 8" tall and - umm - rather on the large side, so need a larger than average cabin) I think the cabin is horrible and it is an absolutely woeful drive. But it does say Mini on the front
Edit: BTW: I've put my money where my mouth is and just ordered the Audi A3 Quattro s-line...