Why not pick the crank to match the group you choose for the rest of the drive train? If you are going to mix and match components from different groups, then you might run into issue or have less than optimum performance. And even within the same group name, you need to somewhat stay in the same series. Especially if you don't know the things that will work well together or the things that can bite you.

The crank itself is not going make your bike better or faster.