I used to be a serious powerlifter (3x8 with 275 on bench, 400 on squat). Not world class or anything but fairly significant. I've been lifting again using DBs for about a year and I'm outgrowing the 50s on my core lifts.
I'm shying away from dumbbells for two reasons: I can't work legs as well with them, and they are frigging EXPENSIVE once you need more than 50's or so (and I'm already using 50s for sets of 12 with shoulder press). It's cheaper to buy a 300 lb barbell weight set than to buy just a set of 75 lb dumbbells here (let alone the 60s, and the 70s, and the 75s and the 80s).
I know there's some people that get a lot out of DB squats, but frankly, my wrist and hands tire out well before my legs when I try those. I use 'em for straight leg deads and lunges, but I have to be honest, I hate lunges more than squat. They hurt more and still don't seem to add as much strength. DB straight leg deads kick ass though--I'm at 4x12 with my 50 lb dumbbells.
I'd be using the cage with a bench to do barbell presses (flat, incline). I would be using it without a bench for things like military press, squats, upright barbell rows, etc. I'd kind of like to try deads again too, but bumper plates cost a frigging fortune.
Currently I'm doing shoulder press, lunges, straight leg deads, curls, and upright rows (using a kettlebell) and alternating swings+catch with a kettlebell.
Ugly people have sex all the time. We wouldn't have 6 and a half billion humans if you had to be beautiful to get laid.