Hi, Fitstick! It's me again!
I would suggest kicking over the traces and getting a 5-disker, rather than a single-disc Sony model. Having multiple discs already in the player cuts down tremendously on the time required if you want to mix and match segments from various workouts on disc. And because you save time that way (not to mention the irritation), you just get more and more fit because there are fewer lulls in your session.
One thing I like about my Sony (keeping in mind that I'm a technological Neanderthal who's never mastered the programming features) is that you can "mark" a specific disc at a specific point where you want it to start, and the "mark" will be "remembered" by your Sony player for at least a week. Thus, if I want to do a mish-mosh comprised of, say, Rhythmic Step warm-up, Power Circuit circuit segment, and Boot Camp cardio/lower-body only premix, one of the Ab Hits plank segments and Cardio+Weights ab routine, I can place each of the discs in trays 1-5, mark the beginning of each segment right after it starts to play, turn the machine off, go to work, come back home, start the thing and just go to town using the "disc-skip" feature when I'm done with each segment. Too cool.
The more discs your machine has the more you can customize each workout. The only problem will be that you develop too many cool workouts, and have to puzzle through too many good choices.
Can you tell I've had a tad too much espresso already? }(
A-Jock