Next car dilemma: 997.1, turbo'd 987 3.4s, e92 M3 or C63 AMG

[northerner]

I'm getting bored of my stage 1 CLS 55 AMG and fancy something different.

I've seen the 997.1 and 987 porsches that fall into my budget (@£25k) suffer from a number of issues but I quite fancy a porsche for a change. Was also thinking about the TPC turbo kit for the 987 3.4s.

Views on the shortlist would be welcome.