I havn't seen anyone state the obvious answer; to get best passive investment plan first you must know 1) your resources at hand and 2) the best applications of those resources.Cash, credit, connections, know how, SEO savvy, on and on, each lends a totally different and unique set of oppertunity, first you must have a good analysis of what bullets you hold in your belt.

What do you guys target as your most important keywords to bring people to your buying site?

These are the top few I'm using based on Impressions off of AdWords

1.We Buy Houses (with and without your city)
2.buy my ...

Learn SEO, Understand it.

Do you think SEO could EVER beat me?

Jerryll is a gucci gangster when it comes to SEO.

Pick something unique if you want internet searchiness (SEO)

I've been using it to help with SEO and Google Analytics buy developing custom pages and the like. 

If I could fly back to the past, I would tell myself to do SEO sooner.Thats really it.Unlike a lot of people I did it the right way.Instead of winging it and following the crowed, I did my research first.I asked myself "what do I need to become a God".Then I asked myself what does everyone here seems to be missing.The answers are the same.Highly motivated seller leads.So I asked the next question.. how do I get them.What is the BEST way to get them.Well FB ads suck.

For SEO purposes there is honestly nothing better.  

Emails historically have some of the lowest conversion, but it's practically free compared to other marketing channels like direct mail, SEO, social ads, etc.It can be powerful in tandem with those other channels i just listed.