Tracking long tail rankings

Hi all - I'm wondering how many long tail keyword rankings people usually track?

For any given niche, I'll usually track my theme keyword plus maybe 4 or 5 category keywords. That much is a given.

However, I've also recently been using Market Samurai to generate a whole list of long tail keywords for each of the above too (using anything with an SEOT of 5 or above as my criteria). I'll then also write posts based on these too (gradually over time, of course, not all at once!)

This sometimes results in 100s of extra keywords to track the rankings of.

In one sense this is great - I can see which other keywords I'm ranking well for.

In another sense it's a pain - every additional keyword being tracked results in longer times waiting for Market Samurai to bring back the rankings for them all each time I check.

What do you generally do? Do you track all the relevant long tail keywords anyway? Or do you only bother tracking the main 'top level' keywords, because it takes too long to track all the others? Is there much point in tracking rankings for all available long tail keywords at all?

Any thoughts or words of wisdom appreciated!

Dave