Lane,

what's your budget? Can you afford the M60's? If so, go for them. You won't be disappointed.

To validate your question, yes, floorstanders will give you a fuller sound than bookshelves.

What about center channel? If you are putting one lying down on a TV, the VP100 is more than enough for your room size. But, if you can fit another M60, or an M22, as a center channel, standing up, that's even better.