If you are going to register .ca domain names, sibername.com will be the best option for you. It happened so that it is reputable Canadian company which has many accreditations, so why not to trust it.
I have found out that it offers nice specials:

.CA Domains $12.95 CAD
.COM Domains $12.95 CAD
.ORG Domains $12.95 CAD
1 page web hosting and email forwarding included

So, give them a try.