Pilot 2519
I recommend a conversation with Jamie @ Paris Audio (LA) before you decide on a sound system. He has done good things for many Boxsters in CA and beyond.
See what the folks in the bay area have to say -
http://www.babblers.org/recommendations/index_nf.pl?vendor=67&show=3
He used to hang out a lot on PPBB a year ago when I used to hang out a lot at PPBB. Now that I have a job again, that place has way to many posts to visit regularly.