Welcome to ScubaBoard, the world's largest scuba diving community. Registration is not required to read the forums, but we encourage you to join. Joining has its benefits and enables you to participate in the discussions.
Benefits of registering include
The RK3s are my go to fin for scuba diving.Mares makes good fins (have a pair). My go to are Deep 6 Eddy fins. I'd look at that or from OMS over RK3s
I find the regular RK3s too soft. For snorkeling the RDK3 HDs are too heavy. The Eddy fits the bill, as I snorkel and scuba dive on vacation.The RK3s are my go to fin for scuba diving.
I'm not sure I would recommend that many scuba fins for free diving. While they would work, the designs are favored toward scuba.