Typically, the Canadian tax will be greater than this and you can get it back with a foreign tax credit filing - so you are NOT double taxed.You can also charge active management fees from the Canadian corp against the C-Corp and withdraw funds that way. 

We both work full time, so I think the downside I need to consider would be a slow down to our ability to save and calculating the opportunity cost of our savings.  

The issue of course with doing it on your own, with just your own money is that you will run out or go really slow.

Slow and steady has worked well...no regrets.

I don't see see things slowing down here in Round Rock any time soon, so I hate to let go of properties in this area--in fact I just sold one in another state so I could bring that equity here to this market. 

I do this when my "Official" job is slow. 

Real estate is a “get rich slow” scheme.Slow and steady wins the race.I did not buy my personal residence until I had 25 units.

And if it is, can my personal LLC withdraw 50% of the profits (rent, gains at sale) legally? 

Does it just become instantly 100% taxable like a withdrawal or is it worse?

Make the offer contingent on the unit with the slow/late/tax return paying tenant being vacant at closing.