I'm going to invest in some adjustable dumbbells. Right now I don't have to the space for more free weights. I've tried the Bowflex ones but did not love them. I'm thinking about getting some Powerblocks, but I'm not sure which ones are best. I've done a bunch of research, and am leaning toward the U33 with Stage II, but that only gives me up to 33 lbs. However, I'm not sure I'll ever need more than that (I don't think Cathe uses more than 35 lbs on any exercise from what I've seen in the user guide). I'm not super-fit, so I'm starting Xtrain to try to get back in shape (starting with the low impact rotation first). For a moderate fitness enthusiast who mostly just wants to get fit, what is the heaviest weight I would likely need for Xtrain?