Gilroy, we have one very similar to 1), in the kitchen. I use the R/O water for anything we drink or for what I cook with. I'm not sure a system like this would work in a shower. The tank holds the already filtered water, and once you "empty" it, it takes awhile to refill (the filtering process is not fast).
If you're worried about fluoride and other contaminants in all your house water, you'd be better off getting a whole-house system. Sorry, but I can't recommend any particular kind. Our little village (117 houses) has its own well with no added fluoride. My husband is on the village water board, and we have some of the best water in our state!
I'd suggest you contact a few of the larger plumbing companies in your area and see what they recommend.