Congratulations on the move. Vancouver? Do some research about customs and duties. I'm not an expert, so this is a "as I understand it" suggestion. If you are moving, and you have the paper work, then all your personal household belongings including the Mac Pro come across duty free - also GST free (a value added tax that is not a border duty). You will likely have to fill in a big form with values, etc. If you are moving it all in a lump then it'll be one form for one shipment.
If you bring the Mac Pro in separately, then it may get more complicated. Technically its still personal household goods, so duty and GST free, but the paperwork may end up being a little more complicated. Just talk to the customs people before-hand and explain. Better than waiting until the last minute and inquiring at the border.
To address one of the answers above.... just because something may cross the border duty-free doesn't mean it crosses GST free. GST generally is assessed at the border, as if the goods were purchased in Canada. Again, if you are moving the GST shouldn't be added to personal household goods, but if you ship the Mac Pro separately then it may not initially get counted as part of your household. How are you moving the rest of your goods?
If you are moving to the wet side of the west coast, here is a tip no newcomer takes seriously enough. Keep Your Feet Dry In Winter. Forget fashion, and wear wool socks (or other synthetics that stay warm when wet). Forget cotton socks in winter - you'll hate the west coast in winter if you wear them. Trust me on this.