Transparency: What speakers have it in spades?

When I got my Spendor SP3/1P speakers a few months ago, I discovered what transparency really meant. I've never been able to hear "through" any speakers like I can with these. True aural "Windex." I wouldn't mind having some of that crystal clarity in a speaker that goes a bit lower, offering more of a bass foundation for orchestral music. The larger Spendors are obvious choices.

But what speakers have you heard that have struck you as being particularly transparent? THANKS.
-Bob