I have owned 4 944/951's and I will tell you first..
They can be expensive to maintain
You must get a PPI
A clutch can cost huge $$$
Timing belts if not taken care of can break and bend your valves
These cars are getting old!
Those are just a few items... that said..
They are fun to drive and well balanced. I drove a 951 for years in the winter, you must get snows.
Check out the 944 forum on Rennlist.com
If I was going to buy one I would probbaly look for a nice 944S2
my .000944 cents