The Creek is going to be slightly more punchy than the Brio-R. I've owned the Brio-R and the Mira 3, as well as heard the Creek over at an audiocircle member's house a while ago. I preferred the Creek for its overall space, midrange presence, and ability to separate voices.
Still, you have that Rega synergy throughout the system to consider.
Still, you have that Rega synergy throughout the system to consider.