I searched around for a low-cost, quality high-back PFD, and I stumbled upon the Onyx MoveVent vests. I was originally going to purchase the Dynamic vest, but found the Torsion online for not much more money, so of course, I went with the "better" pfd!
I really like the high back of this vest, with my rec kayak seat back, I can raise or lower the seat to my liking, as this vest does not interfere! The vest fits well, I wear a L size mens shirt, which fit a bit loose, and the M/L vest fits great snugged down! My arms are free to move and paddle, and the vest almost feels like its not even there. I really like the fact Onyx incorporates a whistle into the vest via a lanyard, small addition but EVERY PFD sold should have an attached whistle!
If you're on a budget, I would take a look at the Onyx MoveVent line up. I like mine, and would buy it again!