Don't think, just do.
987.2 is possibly THE pick of the bunch. Beautiful flat 6 engines, hydraulic power steering (not electric as all generations since) and wonderfully balanced. IMS and bore scoring issues have been addressed too. With the advent of electric power steering in the 981 and the 4 cylinder turbocharged 817 (GTS and GT4 models notwithstanding), the prices will get stronger and stronger.
The standard equipment can be a bit meagre so i'd try and find one with Bose stereo (if that matters to you), sports seats and cruise control are also desirable. Spend the few hundred quid it costs for a pre-purchase inspection if at all possible and buy on condition, not mileage. Enthusiast owned are likely to have been looked after better. Parts can be expensive but there is no need to visit a main dealer for servicing (unless it has the balance of a Porsche warranty, again that's desirable). It's generally accepted in enthusiast circles that you should budget around £1k for preventative or necessary maintenance when you've bought it (again the pre-purchase inspection can allay any 'Porsche Paranoia')
I've had a 987.1 Boxster for the last 5 and a bit years and I love it dearly (the standard stereo is absolutely rubbish though).
As I said, decide if you want a tin top or a convertible and buy on before the prices rise.