Thanks, Kana813. The Townshend stand seems like it addresses all of my concerns. It seems like it would work equally well on my current wood floors and, when spiked, on my potential future carpeted floors. The Soundocity stands seem like they might work OK, too, although the big honkin' spikes seem designed for carpet.
I'm going to check in with Townshend and see where I might find them here in the U.S.