I'm a Miami based agent who works with investors, experienced or brand new! 

Are there other markets I should consider based on my criteria?

It isn't electrical work based on what you are stating.  

The ease of buying and selling real estate wouldn't exist without NAR and MLS.Either way, this is like someone suing attorneys for charging a base of $250 an hour as "That's what they charge" and then a jury finding the attorneys liable for price-fixing.

My most recent build cost I put together for a house build on an empty lot was at $300/SF as base cost.

Perkins - I'm based in Atlanta and fund a lot of SPEC new construction projects here, from 1-4 to 30-35 door multifamily and mixed use. 

The reality is at the beginning of your journey you should be happy to get on base.

Some banks may only loan based on the value of the land.  

I'm based in Virginia.

Of course, the rate can be slightly steeper than the conventional loans where it is a full document loan, where they need to qualify you based on your income.Alternative way, is to acquire the 2nd property as an investment property with conventional, while putting 15%-25% down payment.