I have two options in front of me either to obtain a rehab loan, which will cost me $10k for six months ( points, fees, interest) or just finance the entire deal with my own money (cash).The rehab loan will enable me to obtain an additional property, so in six months i'll have two properties ( one with the loan, another with my cash)  but it'll cost me an extra $10k (on top of the regular down-payment which in any case i'll have to lay out) .

Does anyone know of any database (or website) that allows a landlord to report a "bad tenants", i am not talking about credit agency. just a simple database that allows a landlord to report a tenant that caused damages or did not pay rent?

There are two power systems, battery operated or hard wired, which allow the meter to communicate with a wireless router that sends the data to a database at the company (this is accessable to you the owner/property manager via the web) and then a bill is sent to the tenants automatically at a interval that you set.

Practically you can search Zilllow's map with the school and crime layers enabled.

The most traditional avenue that most banks/credit unions will enable are the typical refinance (cash out refinance) to access equity. 

Anyone know where to get a good list or start creating a database?

Your database should consist of individuals, friends and family members that already "know you, like you, and trust you".

I'd prefer 10 year loan but I'd be willing to do 30 year if it enabled us to have another rental. 

Even sophisticated folks rely, at best, on databases like CoStar and REIS which hardly provide any big data analytics.

There isnt a whole lot that you can do as an investor, other than support programs that enable housing to be affordable, and be a part of those programs.