My 2002 GS300 has 80K miles and the struts are getting a little weak. This is a street car, I do not plan on autocrossing it, nor do I consider it a sports car. But I would like a bit more damping than stock, just enough to take the float out of the ride.

New OEM? KYB? Bilstein?

 

If you can get Bilsteins get them, they are always my first choice if they are available for your vehicle. They will ride and handle better than OEM and almost any other brand of strut.
Note that Bilstein makes most struts in a B4 model for an OEM stock like ride and a B6 model for a sport suspension better handling and somewhat stiffer ride.

FYI Sachs is another German brand that appears to have an application for the 2002 GS300, although Bilstein would be my first choice.