Listing agents don't care.

The best source of funding is subjective because it's going to vary based on what's important to you.Do you care more about the terms?

The pre screen took care of most of riff raff and the 25$ application fee took care of the rest.

It seems like you assembled a good team of professionals and more importantly understand the importance of surrounding yourself with these individuals.

Hi @David FernandezI´m not a qualified expert and you should certainly seek professional advice on this, but I have borrowed from non US residents in the past and my understanding is that a 30% withholding tax would apply.

As long as you qualify, most banks won't care if you do or don't own your own home first. 

If you're using a professional PMC, then there shouldn't be anything you need to do.

Did you work with any real estate professionals (agents, lenders, etc.) that you'd recommend to others?

Just be careful.  

Without a professional inspection and a detailed quote from a contractor, that estimate could be far off once you get your hands dirty.