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.  

We knew this part of Charleston would become popular.

There are various versions of this rule, the next most popular being the 1% rule, meaning you’d have to get $1,000 in monthly rent on the same $100,000 purchase.Per Roofstock, "How Ironclad is the One Percent Rule in Real Estate Investing?"