Most weeks I do at least two or three Cathe workouts and some weeks it seems like it's all Cathe all the time. I'll have the occasional week when I only do one of hers. I'm on a Tonique kick right now, so I do that every week (I've got Premier, 2, and Born to Move). I am getting such great results from Tonique that I can't foresee a week going forward when I don't do at least one of her workouts. At some point I will probably stop reaping the benefits from it and will probably get burned out. Then I'll move on to something else.
I also have a couple of workouts from the new Dream Body set (Fusion Fitness) and I also do Horizontal Conditioning. I have Vols 1-3, Hardcore July and Bootcamp. Recently, I've added Ilaria Powerstrikes to my rotations and a couple of KCM workouts. I've got one Mike Donavanik and I've been doing a lot of barre recently and also getting great results from those (e.g. Tracey Mallett, Xtend Barre, Ballet Physique, NYC Ballet Vol 2, Ballet Beautiful).