@Steven E.
Great question. The areas of Port Charlotte, North Port, Rotunda West & Cape Coral have become very popular for investors. A new construction (if done correctly) can often be a much better value than a resale home especially if you consider the cost of ownership. One of the key questions you have to ask yourself is whether you want to figure everything out on your own; buy a lot, select a builder get a construction loan, and get an end loan, etc. Alternatively, you could partner with investors with properties currently under construction and simply get an end loan on your selected property. Often times this dramatically reduces the issue with build time, as they are already under construction.
@Mike Terry brought up some good points with regards to flood zones and builder quality. Tenants aren't going to pay more just because their landlord needs to pay higher insurance premiums.
@Alissa Kronovet; As far as which market, you want to go a bit more granular and actually look at the street address, understand future zoning, development plans on a busy rd, near schools, etc. Market wise, you can go wrong. Address wise, there will be some that are more favorable than others. You'll definitely want to comb through this to identify the best option.
Let me know if I can provide further assistance.