Though I have been accused of coming up short in the diversification category (my brother, an accountant, says my idea of diversification is buying rental properties in different areas of Jacksonville) I'll pose a thought that I think is a bit counter-intuitive for this thread.  

Even though it may sound counter intuitive, paying down the smallest balance first will help with the psychological aspect of your debt payoff.

I used to use Intuit Payment Network to collect payments (you could link it to QB) and had to switch when Intuit discontinued that to the Quickbooks Payments. 

Sometimes it isn't obvious, and many time counter intuitive, but find that competitive edge.... and it could make a fortune. 

@Tim SwierczekWe currently using Intuit Quickbooks invoices for rent collection.  

Brian Hoyt Here's my perspective and it is counter intuitive.

I use Intuit Payment Network.

The only differnce between the two, is under land type, Owner 1 has the word 'Primary', while Owner 2 has the words 'Front Lot'.I went ahead and looked up each owners' name on the county recorders website to see what info it would yield.Owner 1 has an entry from April of this year that says 'Mortgage Release $11990'Owner 2 has an entry from October of 2012 that says 'Assignment Of MTG'Because I want to learn, time to see if my intuition is on.I think I should be contacting owner 1 as they had the most recent entry and that entry was 'Mortgage Release'.Calling all wholesalers who remember being new, lost but excited and determined.

You intuition is correct, the rooming house can be lucrative - when we bought ours (a duplex), my initial plan was to rehab and rent it as two 4-bedroom units ... then I realized it was servicing a clientele we did not see with our other student properties - International Students.

But it's only an intuition so far