That SRT is a nice little car I see them at the autocross events and they perform very well for a family car
Don't get attached to any one Boxster/S.
There are soooo many low mileage bargains around you really have no reason not to take your time looking for one that has everything you are looking for.
Try and find one with the wheels, aero, stereo, HID's(Litronics) that you are looking for. Upgrading the Boxster parts afterwards is very very expensive. Plenty of cars for sale have most of this stuff on them already. I spent at least $7,000 on upgrades and I doubt I'll get even a third back on that when I sell the car. Not something that bothers me tremendously because I got the car with barely 10,000 miles at an excellent price.