Don't know about the BA, but the Polk is definately a bargain at that price point. As far as it vrs the Wharfedale, I would imagine it still comes down to personal preference. Needless to say, that price point is also fairly hotly contested.
What the heck is up with BA? I know they were bought by D&M Holdings (Denon/Marantz), I know they build some nice products (I own their Receptor Radio), but I can't seem to find many reviews, or in the case of the CR77, any.
Dunno. They make fine products to be sure. Probably in the same vein that Polk + Klipsch don't receive huge numbers of reviews, BA doesn't because they are a bit more mass market (they're in BB now @ the Magnolia section).