If I were to recommend a substitute for CTX Upper Body Split, I would have to recommend the GS Chest & Tris + GS Back, Bis, and Shoulders DVD's. Oh, dear goodness! I used to do the Pyramid Upper Body workout, but ever since the Hard Core series came out and I tried these two DVD's, I've stopped doing PUB. You can do the premixes on each DVD, which are shorter, to get a wonderful all-over upper body workout, or if you are feeling like focusing more on one or the other, just pop in that one DVD for your daily workout.
However, if you only want one workout, go with PUB. It's all I ever used to do before GS came along.
For the record: I don't like CTX Upper Body Split. The reps are too fast and too uncontrolled. I like lifting more weight, which I can't do with the CTX workout because of the fast counts. I'm also a huge fan of negative resistance, which takes more control and muscle action. CTX doesn't give me that.