Take a look at some of the regional or national firms out there.

Yes there are lots of options with agency financing as well as local and regional banks. 

I am in the south florida region.

I have a similar idea and was able to find some regional data that includes sold price, address, bed, bath, sqft etc. 

recessions in real estate tend to be regional as well. but the GFC that was global. 

Hello Nicholas,What areas/regions are you interested in?   

There are still regional banks doing stated income HELOCs in my area.

It has a breakdown by region, category, unit, sq foot, property class, etc.

I would budget more for your water/sewer bill as capital region water is not the cheapest and a $100 isn't going to cut it for a house that size with that many people. 

Sounds like you're in a low cost-of-living region but even if you're on the very bottom of the scale in terms of building costs, it'll likely be closer to $150k bare minimum with even the most basic finishes.