If you were happy with your V8 then a V8pro is a no brainer unless I'm missing something.
I've paddled a mates V8pro and I think it would make a great winter / downwind / rough water boat. My current boat for such purposes is an XT with a DK rudder. I'm really happy with it but there's no denying that the more modern boats in this category are better. My favourite is the Nelo 520 which is much faster than it's dimensions would suggest. The V10 sport is a very popular boat for good reason although light weight paddlers can find themselves getting tossed around a bit in rough conditions.
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