With stocks, 401K, and IRA the investment is very passive with really no thoughts at all after the research is done and the money is placed.The house rental, apartment rental, or landlord investment position is completely different.

I aggressively contribute the max 17k/year towards my 401k (6% of it is matched by my employer); and the max 6.5k/year towards my roth ira.

Can experienced people share some experience for the tax of self-directed IRA properties?

Go to public presentations made by self-directed IRA companies.  

Could be some advantage from what I remember about paying for your health insurance and that of your employees and if you are a super saver and want to contribute more than normal amount to IRA/Roth, but want to set up some kind of pension plan.   

If I were to tap into my ROTH and convert it to a IRA LLC or SDIRA what would be a minimum requirement to start?

We hold a great rental property in a self-directed IRA.

I put about 19K in my SEP in 2013 and my CPA says I should add $18K more to max it and hold off on buying more real estate.My first thought was that I never intended for my IRA to be my retirement vehicle - I want a large portfolio of cash flowing properties to be what I retire on.

By the way, for this net worth calculation, IRA's/401's, etc. are included.

The interest goes back on your 401k from what I understand.Second thing I would say is that you need to have an IRA.