If you're not too good at dance, why would you want advanced videos? Don't worry about being "good enough" for your dance classes. You go there to learn, right?
My son is a dancer--he and I both think the best place to learn dance is in classes, with a qualified instructor. A good instructor won't have beginners in advanced classes, as all the movements build on themselves, and getting those "beginner" moves down solid is very important before progressing to the more difficult movements. On a similar note, advanced and even professional dancers STILL work all the time on improving and perfecting those "beginner" steps.