I've been looking at a pair of Revel M20 bookshelf speakers for my 2-channel system. I was planning to add a sub like a Rel Storm III later to fill in the bottom end. Is it better to just get a full range speaker like the Revel F30 rather than trying to mate a sub to a pair of bookshelfs? The money would be about the same in the end. The way I see it, if you get a pair of bookshelf's you won't need as much power as you'd need with a tower since the sub will handle the bass. You also gain a little flexibility with the sub in terms of placement, gain, and phase control. Still, I like the idea of a full range speaker. What do you guys think?