I have the B&M shifter and a short shaft from SVS and am still using the stock '99 shift knob. I really like this combo a lot. I have yet to miss a shift using it. The throws are very short, but have excellent feel. I can feel the gates very well, yet it does not feel too notchey. I think it would be perfect with a Momo super anatomic knob, and would be close to perfect if the shaft were just about 1/4" longer using the stock knob. I am going to keep it as is for now though as I like the look of the stock knob, particularly in my cognac interior and I don't want to mess with cutting the longer shaft that SVS offers down.
I have not driven a car with the SVS shifter, but this set up does not have the problem described by others here. The springs feel just right. They are strong enough that the 2-3 shift is very natural and I have never hit 2 instead of 4 on a downshift. They are not so strong how ever that it feels like a chore to move the shifter side to side.
When I first got my Viper and it had the completely stock shifter set up, I was disappointed in the feel and thought that it was very poor for a sports car. Long, slow, sloppy throws. The set up I have now honestly makes it the best feeling shifter I have ever used.
Special thanks to John, the tech at SVS that helped me with the install and was very patient with my indecisiveness on what exactly I wanted.