I hate to rain on your parade: don't overlook your front to rear drivrshaft. Itspretty simple to check, just get under the car at the very rear of the heat sheild you can grab the rear of the shaft. Turning back and forth should be telling of any failure in the cv joints on either end of the shaft. If there is no play you should be cool but if there is play accompanied bya faintclanking you should persue that avenue.

I recently had an annoying shake and I narrowed it down to that little bugger. Replacing it was a cake walk. 1hr tops.

good luck!