I've been window shopping for Hurst shifters to fit my M21. It seems that I have a choice between the Competition Plus, The Super Shifter and the Indy. It looks like either the Competition Plus or the Super Shifter will set me back around $400 for the shifter and the separate installation kit, but the Indy is quite a bit cheaper. What are the differences between the 3? Is the Indy a poor choice compared to the comp plus and super shifter?