I'm just using the stock shift knob, since I didn't want the overall height to be too short. The ZHP shift knob is nice though because it's weighted. But it makes the overall height too short, so I never went with it. Plus, a light needs to be retrofitted into it to be same as the stock shift knob
Some people have the Jaffster (sp?) a.k.a. dildo shift knob. They're cool because they make shifting easier. The downside is that well, it looks like a dildo