Sue,
I have the full vest and think it's WAY better than the chest vest. I do believe all vests by hill-rom work with the same tubes, so if you wanted to switch to a pink one (or just a full one) you could. It also shouldn't matter how old your vest machine actually is just to get a new vest. People grow out of their original sizes, they break, etc. so they have to be replaceable (and it's usually free). I've had my vest for about 10 years. A few years ago I needed to get a bigger size, so they sent me the next size up for free. Only about a year after that, my resp. therapist said they had pink ones and offered to order me one. I got that one right away for free, too, despite just having gotten a new size.
Long story short (too late, ha), I recommend trying a full vest and you shouldn't have any problems getting a colored one (unless they're on back-order or something) <img src="i/expressions/face-icon-small-smile.gif" border="0">