As a new Boxster owner, my advice would be to wait a bit before throwing all sorts of mods at it.
There is a world of available mods out there, none of them cheap, and you haven't had time to disciover them all. Do some research before fixating on one type. You may want to do wheels, audio, interior, performance. Take some time to research all the options available to you.
Also, make sure the car is first well sorted mechanically. When were the fluids last changed? Polyrib belt? Have you tested the battery? Brakes? Tires? Maintenance and repair costs on the Boxster is not for the faint-hearted, and can have you quickly wishing you'd have waited on that body kit so you could have put the money where it was really needed.
There's really no point in having the best looking Boxster out there if it won't roll out of the driveway!