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shmish said..
I think the top choices at this time would be the fwind i76 or i84 from Slingshot or Neil Pryde medium front wing.
I've got a direct comparison of the i76 and i84 for different weights. My wife is about your weight, and has mostly sailed the i76. I'm around 195 lb and usually on the i84. We mostly use old windsurf boards (89 l FS and 117 l / 71 cm slalom). We need about 11 knots readings from the iWindsurf meters to foil on 5.2/6.5 (which is about 9 knots measured on shore if the fetch is good). It's more fun when the wind goes up to 13 knots and we use smaller sails.
One big difference when using the wings in windsurf board is positioning of the foil. The i76 sits further forward on the fuse, and is not as long, which means the center of effort is almost 2 inches further forward on the i76. On my slalom board, that means the i76 works well in C position, but the i84 is so far back that it needs a lot of backfoot pressure. I've tried to fix that by drilling an extra hole in the fuse for a D position, which helped a lot, but the fuse broke at the empty hole between mast and wing after ~ 50 sessions, so that's not a good solution. If you're going with a Slingshot foil and your board, you'll probably find the i76 will be better balanced. The NP Glides seem designed for windsurf boards, and may work better.
With respect to bottom end, I'd guess that going from the i76 to the i84 adds perhaps one or two knots. At my weight, I find the i84 easier to pump; with the i76, I have to be a bit more careful. But my wife, who's more comparable to you in weight, actually starting using the Time Code 68 instead of the i76 most of the time. But that may be because the smaller TC68 matches her narrow board better. Now that she started wingsurfing and I don't have a fuse with a "D" position anymore, she's actually on the i84, and I'm on the i76 or (in 15 knots+) the TC68.
Bottom line: start with the i76 or the NP medium. Chances are you'll add another front wing (or two or three) sooner or later, anyway.