Pro 5.0 makes some nice shift knobs. The only downside is they look to be metal, which we all know can be quite painful in the summer heat.

I always liked the leather Cobra knobs (found in the 94-98 Cobras). The 99-up leather shift knobs feel great, but they are charcoal instead of being black..so if you are anal retentive about matching whatnots in your car, don't go with any 99-up knob.

Best shift knob I've ever used was a rubber golf ball style knob out of a GTI (threads on to a Focus or Mustang handle). Perfect diameter and excellent grip. No matter how sweaty my hand became at an auto-x, I never missed a shift from my hand slipping off the knob.