Another vote here for the Bluefin. That is the best ski I've ever paddled for learning to paddle downwind. Stable, comfortable and surprisingly quick (in the context of beginner skis). It catches and surfs waves really easily and is not upset by side chop like some of the very flat bottomed beginner skis.
I'm not sure that you specifically mentioned downwind paddling but if that is something you are working towards (and it should be) you absolutely must have stability.
I've had my Bluefin for years and I still dust it off for the occasional gale force downwinder. It's obviously great for friends with no paddling experience too. I can't imagine getting rid of it.
Current boats
Epic V10L Ultra, Epic V9 Ultra, Carbonology Sport Boost X LV, Fenn Bluefin, Nelo 510, Fenn XT double, Nelo 600, Expedition Kayaks Azure, Mirage 732.
Previous boats
Spirit PRS, Fenn Swordfish, Fenn XT, Fenn Swordfish S, Think Zen, Epic V10L Club, Carbonology Sport Boost LV