For right or wrong many sellers do not like FHA. 3) Larger loan limits as shown below.With most lenders 75% of rents will be counted as income for helping increase your purchasing power like always. 

Do I as a seller have any option at this point, or do I have no choice but to sign the letter and release the earnest money to the buyer?

For those looking to connect with sellers in military markets, you always have to keep in mind that the cost of homes is substantially lower than that of the larger metroplex's that neighbor each market.

You might have no choice but to pay extra.

If it's a larger organization, feel free to inquire about their different staff qualifications.2.

The problem I keep coming back to in my mind is the choice between holding rental properties, and flipping.

If you find any larger multi family deals they are usually over priced and or in a lower income area.

However, I am currently very torn by my current choices that I foresee.

You'll usually need some sort of guarantor that will not declare bankruptcy the minute something goes wrong; too easy to do that in an LLC.Once you have a track record, private money folks will lend to you, and on larger properties (large MF) commercial real estate banking looks almost exclusively at the property.Spend some time researching the financing options.  

I'm looking at some nice areas in Tennessee that are a couple hours from major cities, but may be near scenic and/or natural attractions, and slightly "larger" smaller towns, like the county seat.