@Dan Tsunekawa
I will not comment on TK since I'm / was a TK/MLS buyer.
Do you have a loan officer / bank lined up for your investor loan? What I heard is that banks don't like sub-$50K loan - unless you have a relationship or a commercial loan set up. I have not ventured into sub-$50K loan in the past and not planning to either so can't tell you from experience.
Capex of $125 seems low. From what I remember reading on BP from Ben Leybovich, I think he used something like $250/month per unit as minimum. You can search up on BP to find his Capex article.
Not sure about the area to get rent / price of 1.5 and TK property. Do some research of the area before you buy.
For you to keep acquiring properties, watch out on your DTI (debt to income) ratio as you grow.
Personally I hold at least 6 months worth of PITI in case all my units are empty and I can't find anyone to fill my vacancy... Of course this doesn't account for repair / emergency / insurance deductibles so if everything happens at the same time I'll still be in trouble. :0
Good luck investing!
Henry