Hey Captain_Rawhide,
My recommendations on keepers are the tier VII and VIII, the Sinop and the Vladivostok. The Sinop is really strong for Tier VII and the Vladivostok is more because it looks like a racing boat, not necessarily its performance =). The Sinop has a lot going for it at Tier VII and that is the one I would recommend to keep the most especially with Ranked Sprint coming up and the MM you can get at Tier VII. The Tier V Pyotr is ok but I do not play that much at Tier V so you might want to ask others on that one.