You'd be better served by keeping Brash Strike (specially with the Style feats I told you about) and get Pinning Smask (Hit: damage, and target is immobilized until you are no longer adjacent to it... note the lack of "save ends").
Dear friend, I respectfully disagree.
In the Brash Strike case, granted, its a great at-will power and you know I am frequently swarmed, sorrouned, flanked, ganked (you get the picture), so I am frequently giving CA already. So I would be fool not to use Brash Strike? Wrong.

I know myself Claudio. I usually play safe. I feel responsable for everyone's well being, so I tend to favor Crushing Surge.
I enjoy my Temporary HP, and quite frankly you know I need them. I like the theme of Brash Strike, remmembering a super power attack, but I also miss my Shield Bash.
So for flavor I intent to get Knockdown Assaut and call it "Neo-Shield Bash" for flavor. If you are worried about my effectiveness just remmember that damm Harpy. Jeez, if we havent droped her from the sky we would ended all dead, blinded and toasted.
So I am following someone's advice (cant remmember who), and I will not require 2 equally usefull at-wills. Crushing Surge as my main attack, having Knockdown Assault ready when needed (specially when the rogue does not get flanking position...).
Regarding the Pinning Smash: its great! I fully agree, but I can already sense the table discussions comming. If it were a magical effect - ok, people tend to agree with anything that is magical, becuse its magic. But its not, and I dont want to cause any trouble there. If I pin down some major badass boss we will probably have a headache. Rain of Steel keeps the character's flavor and allows me to kick some serious minion butt.
