I'd get married again... best money I ever spent.
On a serious note, I've been beaten to it. Probably a remapped A5 3.0 TDi or a Golf R with change to put towards the mortgage tuning it. That said, I've gotten very bored of simply not being able to safely/legally enjoy my R on the road lately, so perhaps it would be GTD for work and something fun for the weekends/track.