First - let's make sure we are all talking about the same thing. The shifter as I refer to it is the mechanical linkage and the shift knob is what mounts on top of the shifter and is what you hold on to.
How crisp is your original shifter? Are you confident with each shift and gear you are trying to hit? There seems to be a large discrepancy between each stock shifter. If your shifter is OK, changing to a shorter shift KNOB will reduce the length of the shifts. If you are not confident with what gear you're reaching for, just changing the shift knob will not do a thing.
I switched to a B&M and could not be happier (although with how sloppy my old shifter was, I'm sure I would have been happy with any of the aftermarket shifters). Nice crisp shifts, never having to guess what gear I reaching for, and yes I do have the MGW shift knob which completes the package.
The install was easy and I picked mine up on ebay for about $225 which was the best money I've spent on a mod.