I second Jo's recommended list. I have many of the classes she listed.
I LOVE Suzy Furrer's classes. So much to learn from her, and her teaching style is clear and concise. All of her classes are worth every penny.
I like Janet Pray's Sew Faster class, especially the Garment Industry Secret class. She's also a good teacher, confident and she knows what she's talking about. I have learned more efficient way to sew (no pin sewing and order of construction).
I also liked Susan Khalje's The Couture Dress class, but it may have been discontinued?
It's neither garment sewing nor quilting, but I liked Annie Unrein's classes. I have travel organizer and backpack class. very pleasant to watch and it's a fun project, too.
One thing I would say is that to pick a class with the coupon code you have, and just wait to buy other classes. Craftsy runs the $19.99 sale all the time and I have not paid more than that for any of the 40 classes I have. They do sometimes run even bigger sale for limited selection of courses (I just got Fast-Track Fitting class for $12.99).
It sucks that you have to pay VAT though.