I have given this a lot of deep thought, and...damn this is hard, but I'd probably have to go with Regency. There's such a glut of books, both romance, actual time period, and fantasy-of-manners, Napoleonic war stuff that you'd probably have the best chance of finding anything good to read at any given time.

And I have plenty of writing ideas I could set in there. Last Year's was originally going to be a Revency Romance, but I shifted it up to the 20s.