This is the percentage of costs (purchase and rehab) covered by the loan.

I asked if there was anything else we could try, he got very angry and demanded I pay him in full.

And use the other $50K as a down payment on a $250K property. 

I would go with the one that is the specialist in the area.

Driving around the neighborhood over time, I saw the same van at a few other houses.

I also treated studying like a full-time job.

A PMC is the ONLY one that will deal daily with your property.Here's some copy & paste advice on hwo to screen PMCs:Recommend exploring as many sources as possible to get referrals AND cross-reference them to get as much accurate information as possible.Check out NARPM.com, BP’s Property Manager Finder (BiggerPockets: The Real Estate Investing Social Network), etc.Also, encourage you to learn from the mistakes of others - by reading posts here on BiggerPockets about owners not having their expectations met by their current Property Management Company.

The data @Devin Conley posted is pretty solid from my experience (I do not know Devin nor how he sourced the data, just going by my own investing experience).  

A full interior rehab will be about $40,000.  

Does seasoning start when the property is bought?