Which suspension package?
 

As you've read, I have to redo the rear of my 99 986,,,, 80 k miles.

New track arm , new link and lower CA,

While its laid up figureed might as well get the OEM suspension replaced

Here are my choices

M030 euro susp

D2 coil over

Ksport CPO-02KP

All are within $300 of each other

I do 9k miles yr with 5 track days, was going to get a set of r compound tires this yr

Just my opinion based on what I read of your amount of driving: I can't comment on experience with the different setups, but since it sounds like you drive it more frequently than the typical seasonal driver, and you track it, you could go with the M030. You know it's going to work, you know it's going to provide improved handling and a slight lowering if you're into that, and you also know that it's not going to kill the street driveability of the car. I don't track the car (yet), but when it comes time for the suspension to get done, and before any tracking, I want to go with an M030.

what you want to get is the ROW M030 suspension it works really well at DE's and AX's I'm not familiar with the other two but I ran the row for a while and was quite impressed.

I've had the Ksports on my car for about 3 years now and I'm very happy. I did need to get adjustable rear toe arms, but it was worth it. The car is quite stiff a feels very planted in corners. An advantage to the Ksports is that they have adjustable top mounts giving you a great deal of negative camber adjustment.