It seems pretty similar to the popular DealMachine but less expensive.

Happy to help you or anyone else out regarding popular towns for investment properties. 

Act in less popular times when sellers may be getting eager to offload the property.

I think a popular response to posts like yours that you have probably read many times, being that you have been in the BP community for for a few years, is to figure out your "why."

New construction is the most popular and has the easiest exit strategy. 

I think I finally found one that is confident in doing it but in my area this concept hasn't gotten popular yet.

My very first transaction went amazingly smooth, I helped sell my buddy's Condo in a popular western suburb, I worked hard at pricing it correctly, I posted great pictures to the MLS, wrote what I thought was a good description and within two weeks I had an offer and we were under contract and the place sold. 

. —- Is anyone an investor in the DE market(s) who would be willing to shed some light on other popular market or up & coming areas?

Look on Zillow, or whatever is popular in your market-you may be missing out.

It is so easy to say a property is a particular class of property and 'C' class is the most popular because it sounds inexpensive, middle-class and a few a few nicks and bumps are excused.