HI Debra,
I think if Low Impact & High Intensity is what you crave, then the Low Impact Series would probably suit you best & Cathletes get excellent results from it. I would also throw in SuperCuts from Xtrain as a low impact get-alot-done type of workout that will burn fat.
The beautiful thing about ICE series is that it truly gives many options for shorter workout options (which I love), although there are some very high-impact portions of it. At least, I felt so. As Boomer already mentioned to you, you can try everything out first OnDemand and find out what you are into.
When you say you were always slim, were you someone who erred on the side of slim & responded quickly to weight training? Just wondering which body type etc. you are. I find different women respond to different kinds, volumes etc. of training & of course, it changes throughout life. I am not menopausal myself, but I am running into this type of thing lately. I am not seeing any extra benefit from working out more often, so I am going to cut back my schedule to four days a week & do more walking. My waistline responds quite well to grounding & de-stressing self care activities like walking outside. I also do some pilates, as boring as it can be usually. Also, have you been making any nutrition changes along with your change? Eating enough, including good fat, magnesium etc.?
(Sorry if I blabbered about there ....)