Thanks for the comments. I do really love my Boxster and see no reason to change or upgrade to another Porsche. I have had a few Porsches in the past (996 GT3 CS, 996 Carrera 4, 964 Convertible) and the Boxster is (still) a great machine.
The only optional move would be to sell the car and buy a 996 or 997 Turbo Convertible. But that would cost even more.
I always love a challenge so upgrading the Boxster is one of them

. My car made 320 HP at the crank. An easy but not so wise upgrade is to go to a 3.6 tuned and have about 340/360 HP at the crank (and sell the 3.4).
This is my ride: