The Emmakites wind ranges seem reasonable as far as they go, and in accordance with my general experience with Windrider IIs (the lower wind comment may be a suggestion that one may have to take a step back while launching at the bottom end). I have the Std, Vented, X Vented and XX Vented.
Give your Vented a go and see how you like it before leaping, perhaps. I like mine but find I prefer a good 15kph (10mph) to fly it comfortably, and it is good to ~25kph (16 mph though will handle to 20+).
My XX is good (for me) from 20mph on up. Have flown it comfortably up to 35mph-ish but that may be pushing it for regular full time flying (for me anyways). Capable of lower; more work and switching of knots.
After that I might start to wish I had one of those flying frame things like a Xanadu or something.
In respect of the cloth used: to date, the PC20 versions are holding up okay -- no rips or tears or holes developing yet on the most used. Wrinkles and fold marks are appearing but are not visible at over 8 feet or so. The PC31 versions are slightly softer cloth, less krinkly but more $$. Value for money wise, the PC20 is great so far. Your experience with your new Vented may be your guide, if you have the patience.
All that said, I am not hard on my kites generally speaking. These are my experiences. So ymmv as always.
PS: so far, no middle of the night incidents to report. Thankfully. 😉