Hi, ! I hope you get some helpful feedback from other community members on this topic. I would talk with your physician, if you can, about possible exercise options. I cannot personally recommend any one single piece of equipment. However, looking at reviews, the Total Gym seems to score pretty well. The biggest "cons" are price and it can be a little hard to figure out at first.
I understand your desire to find low/no impact exercise that you can safely do in your own home and a combination of strength training and cardio is a great idea!
While I would tell you to take anything I say with a grain of salt, as I'm no exercise equipment expert, I do like checking reviews online. Even sites like Amazon will have a nice mix of reviews that may give you a good idea of the pros and cons of the equipment. If you happen to know a physical therapist, they might also be able to offer some insight into what exercises and exercise equipment could be best for you.
Best, Erin, RheumatoidArthritis.net Team Member.