You got a good piece of advice - 2 sails! Get a standard sail and a vented sail! You can get the second as a "kite only" package and not get another set of handles and similar lines that way!! Plus with the 2 sails, you should be able to get 3 different frames that are completely interchangeable for both sails!
Yes, there is a sweet spot for a midvent, (most of us have one), but those 2 sails have enough overlap wind wise, to cover just about every wind you'll come up against! Which model you decide on - "B", SLE, Pro, etc. - is entirely up to you (visuals) and your wallet (money)!