<A HREF="http://www.ncix.com/canada/" target="_new">NCIX</A>
<A HREF="http://www.shoprbc.com/ca/" target="_new">ShopRBC</A>
Just a couple I know, <A HREF="http://www.googlegear.com" target="_new">GoogleGear</A> ships to Canada but all their prices are in US. You can also check the <A HREF="http://forumz.tomshardware.com//modules.php?name=Forums&file=viewforum&f=1" target="_new">Computer Shops</A> forum.
<A HREF="http://www.anandtech.com/mysystemrig.html?id=24106" target="_new">My System Rig</A>
<A HREF="http://service.futuremark.com/compare?2k3=535386" target="_new">3DMark03</A>