I have a basic one, but am looking for something more robust for both smaller project (duplex) as well as a apartment building 

I really think you should use a more robust modeling tool for a 37 unit. 

Those are two separate entities and a judgement against the self-directed IRA would be very hard pressed to go after the other IRA.A more robust option 2 would be to use a Checkbook IRA LLC. 

I have created and am using a robust user friendly pro forma workbook to vet and analyze any size multifamily property.

Generally, the TX real estate market is very strong and thriving right now as companies and individuals are relocating and the state supports a robust economy.

I said that I wanted to stick to a robust, *low risk* area that goes up steadily over time, and also does not lose value that much in a downturn (this was my first home purchase ever, so I was very risk averse understandably).

I'm way behind the times with social media but finding a robust network there. 

If you have a robust financial calculator a few number adjustment should on your model can easily get you to where you want to be

Something robust and complex enough to house all the data, but also simple enough to be able to draw the key insights as to where the sample property stands relative to the market place and how much rents have the potential to rise.

They actually have a fairly cheap and robust online business banking system for guys like you that initiate a lot of wires called Single Point (at least they did 4 years ago).