GT4 is super low and its front lip rubs nearly everywhere...but as I'm sure you know, it's a blast to drive.
Is your wife set on the pdk? Personally, if I was looking at a 997 tts it would be a manual. Especially with the way Porsche prices are trending.
How about the new 991.2 c2/c4 (s)? I drove the new 991.2 c2 s and it was quite impressive. Easily, putting my 991.1 c2 to shame in acceleration.