Lars,
I am currently involved in the Destin/Miramar/Sandestin market. However, this is not from a condo perspective but rather VR homes, lots, notes...with partners. I do have experience with one condo (2/2) that was in Hidden Dunes & used more of as a second home & rented minimal.
I would check the regional maps on VRBO / HA for each condo of interest & work my way down. The association fees can be high but provide several amenities. The access to specific beaches also have an impact on issues such as parking, chairs... Location is important & thus reflected in the units price.
The SOWAL RE forum is a good place to ask questions. Flipkey / TA has an active Destin forum from a renters pov. If you are comfortable dealing with people then managing your own unit will obviously provide the best ROI.
An available & reliable one stop source for this information (gross, net..) is not easy to find. The cost associated with the condo can be provided by a realtor. I think using the peak summer months will help off set the units costs but as with anything it depends.