Re: What should I buy next?
Yeah, I would say P3 GTV too, but make sure you go for the 3.2; more go (& show) for considerably less dough than a Brera, in fact you could do some really lovely mods with half the money you would save. I absolutely agree with the exclusivity thing too - GTV's are rare, P3's are rare GTV's, and 3.2 V6's are rare P3's...just imagine if you managed to find it in Vela Blue!
Also, remember that you are effectively driving a car that was designed nearly 15 years ago, so it'll be a bit more 'agricultural' than a Brera (I suspect, although not having driven one I couldn't really make the comparison.)
One final point I would add is that having already owned a GTV you will be very well acquainted with its 'foibles', and perhaps a bit more prepared to get stuck in if something (usually only minor electricals) goes wrong than if you had a Brera. Shouldn't really give you too many surprises.
Good luck & enjoy!