It is a complex sentence. The dependent clause is not a noun clause. A noun clause would function as a subject, object, or subject complement. It is an adverb clause.
I'm confused. I assume "There is so much variety" is the independent clause, and "that you never have to make do with second best" is the dependent clause. Could you please explain why it is an adverbial clause. I don't seem to find the subordinating conjunction word.