Good luck! Well, you already hasd good luck, but hope you have an ounce left if you're searching for another Boxster and get a well cared for one at a good price.
I am glad to hear that you weren't hurt, but it is unfortunate that your Boxster was totaled. I would say get another Boxster, it sounds like you enjoyed driving it. The granite counter tops may be nice, but they don't go 150MPH.
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1999 Ocean Blue Metallic Boxster - blueboxster.com
A very similar thing happened to me about 30 years ago. I had a 914 and the motor was running very rough. It was autumn and there were leaves on the road and it was wet. Whenever I was not accelerating, I had to push the clutch in and rev the engine to keep it from stalling. I was doing all of 10 mph and went around a corner with the clutch in. The car did a 540 and ended up in a ditch. Luckily I was going slow and with the help of a tow from a farmer, I was able to get out unscathed.
Moral of the story is - a mid engine car turns so well because of low polar moment of inertia. It also spins very easily.
PSM is your friend. After seeing what it can do in the rain at the autocross, I would not think of driving on the street without it. Its especially good when you aren't paying attention to your driving or are taken by surprise.
Hope things work out. Glad you are ok and hope you get another Boxster.
I was on the bay last night looking at Boxsters. There was an 06 base with incredibly low miles that looked like it was going to go in the low 20s. Demoralizing if you want to sell, but a great time to buy. I have granite countertops, but the Box is a lot more satisfying.