I'd definately go for the Pentex sails (the jib will be fine as it's fully battened) and the Carbon upgrade.
My ideal order would look like this :
standard boat (US$ 12,900) with the following upgrades :
Kevlar hulls (US$700)
Pentex sails (US$325)
1:12 Internal downhaul system (US$100)
Sta-Master shroud adjustment system (US$35 ) Because this upgrade is just so darn cheap.
Total; US$ 14,000
They other options are cool, but not really necessary.
I've seen the new alu stocks up close and I would be more then happy to have those on my boat. Carbon dagger- and rudderboards; the difference in performance to plain glass will be really small if any. You really have to be a very skilled sailor to notice the difference at all.
Wouter