Monitor Audio BR versus Polk Audio Monitor series = IMO, Monitor Audio
i've A/B'ed the Monitor Audio BR2 and Polk Audio RTi4 (btw, Polk Rti over Polk Monitor series hands down)
Monitor Audio Bronze Reference BR2
you will see with my a/b results that choosing between the two is purely subjective, meaning i have some songs i prefer the polk and some songs i prefer the monitor audio br series
bummer is, we can't decide for you ... we might have totally different tastes.