I'll come back and reference to this once I get back my tenth property which will be soon because i am doing my first cash out to start accelerating this process. 

My advice would be for you go get some experience first, build up some assets/income on your own and then assess how you want to accelerate your investing.Both have their pros & cons. 

We came up with a couple of uses for accelerated depreciation by cost segregation.

Find out how they are succeeding and what they've learned so you can accelerate your learning process and avoid any huge pitfalls, mis-steps, etc. 

So, my advice is to buy the nicest property you can possibly afford that also lowers your cost of living thus accelerating your savings rate.

A mentor will accelerate your learning curve more than anything else.

There's really no difference if it is held in a self-directed solo 401k, even if you accelerated depreciation. 

@Nash Paul one piece of advice, you can accelerate your learning curve and minimize huge mistakes by working with/for someone who is doing what you want to do, so be on the lookout for someone you can add value to in exchange for being close to the action.

If you are looking at ways to fund the reinstatement amount (Which is NOT a fee by the way), you might be running a bit thin, especially if the lender accelerates the note when they find out about your subject to deal.

Ideally, you will greatly reduce and even possibly eliminate your housing costs, thus accelerating your savings rate so you can get to property #2 as soon as possible.