You might as well get PUB first, then immediately start saving up for your next one. CTX is awesome. So is S&H. And PS... we all have the same problem as you! Better just have them all on your shelf.
The drawback of PUB is that when you do the workout, you end up with all your weights out on the floor. Then you have to put them all away. With PS it's just one thing at a time and when you're done, your room is pretty much ready to leave (no massive cleanup time). If you work out at 5 a.m. like me, these kinds of things are important to know.
I just consider putting the dumbbells away as part of the workout and I enjoy doing PUB very much. It's easy to shorten by doing the "up only" or "down only" premixes.
-Connie