The way I read and understand it, if you go with a US clearing firm, but your IB is in Canada you are protected by CIPF which is something I am considering doing. I presume this is why you want a Canadian broker right? Obviously check it out for yourself.
I think it is criminal that CFTC would allow FCM's to keep their money at firm with a trading desk aka Sentinel Capital. Our segerated accounts should be truly be segregated, not comingled. Alot of us were under the belief our money was sitting at Harris Trust when our brokers were chasing higher yield.
Back to your question. I spoke with Alt Capital, my friend has used them. They clear thru Dorman and offer Zen Fire with Ninja and CTS with dorman.