I had a Bowflex that had a seated row attachment with a sliding seat, mimicking a rowing machine. It folded up, too, so it didn’t take up a whole lot of space when I wasn’t using it. Check ebay for used Bowflex Ultimate machines- you can probably pick one up for about $5-700 or so. Check out Bowflex’s website,. Personally, though, I’d go with a good exercise bike (or bicycle) for cardio, and some free weights for strength exercises (if you have the room).