I have several of the workouts you mentioned. Let's see...
Crunch: Burn and Firm Pilates is probably my favorite traditional aerobic workout. It's not hard on my knees, but it does make me sweat. The instructor is easy to follow so I don't feel like I'm completely lost at any point.
I also have the Crunch: Fat Burning Pilates. It's also good, but I don't do it as often because I didn't have the correct size hand weights when I first bought it. I know, stupid reason, but by the time I bought the weights, I found other workouts I preferred

Seriously though, it is a good workout and has the same good points as the Burn and Firm video.
Carmen Electra Aerobic Striptease workout 1 is fun for a change of pace, but it really isn't a workout at all. On the other hand, when your honey watches you workout, you will end up having extra exercise afterward
I don't have Core Secrets, but my friend does, and she loves it. She has been doing it regularly for about a month without getting bored with it.
I have Quick Fix Stability Ball workout and the Karen Voigt Stability Ball workout. (I think it's called BLT, but I'm too lazy to go look

) It seems like I preferred the Karen Voigt one, but to be honest, I didn't stick with the stability ball workouts for very long. Most people I know of start out loving them, but they end up not using them at all after a couple of months.