I raced a Westfield for 5 years and used in on the road for a good few years prior to that. It was superb on a dry track and, on a track day, would lap Brands Indy faster than anything else on the day. However, it was a scary as a scary thing in traffic and, even on a mixed track day, you were way to vulnerable. In the wet it was no fun at all as right hand bends would just launch more cold water into your groin region displacing any water previously warmed. There was always something which needed fixing, or modifying, or both.
If you have a Seven itch, hire one. They are fun to own but not fun enough to make up for all of their down sides. As noted, they are plain frightening on the road and, while fantastically quick, as soon as you arrive behind another vehicle even a mini becomes the equivalent of an enclosed Transit Van as you are too low to see through it to overtake.
If you have an accident with another vehicle you will, most likely, die.
I agree with other points above, and have come to the same conclusion - You can't get enough for 944 to warrant selling it so just keep it and fix/maintain it as needed. It doesn't have to be the quickest thing in the county to still be fun. If you let it it will eat money faster than you can throw it at it, and still not be worth selling. Enjoy it for what it is.
There is a great deal to be said for having a car that is worth next to nothing and owes you very little. You can thrash it and enjoy it and, when something bad happens, either accept the subsequent cost or pat it lovingly and move on with a smile knowing you had value for money.