Based on my ROC, which I completed last winter, I would only buy a radio with DSC. The utility of DSC for emergency communication was persuasive.
I have found the GPS useful for very simple navigation. i.e. crossing howe sound in limited vis and wanting to make a specific landing. The GPS does not replace a real GPS for multi-way point navigation.
DSC sends extra info to CC. ROC made it clear that CC values this. DSC also sends useful info to your buddy (i.e. location) without you having to figure it out. Also useful.
PS. I also strongly recommend you complete your ROC, even if you did it before. Its a skill you want to be good at if you ever have an emergency.