I bought a Rogue S2, the matching bench and dip accessory, a set of bumpers, Pendlay Bearing Bar, and some rubber mats from the Tractor Store. Put it in my basement. Sure beats having to run to the gym or wondering if it will be open on certain days or the hours. I don't know why you would need or want all those other accessories you mentioned. I like to keep it simple though. It doesn't take up much storage either. Before I bought my current home, I rented out a climate controlled U-Haul to use it.
A bar stand is good, but (if you've got the space and budget for it) a full power cage is going to offer you additional benefits and flexibility. Most of my list actually attaches to that or is proximate to it, so it's not like you'd have a huge pile of equipment spread all over the place.
The cage itself is good for squats, rack pulls, shrugs, high-racked overhead press (as opposed to cleaned presses), and bench press, among others. The safety pins can be used for additional protection where the bar might put you at risk, especially in squats and bench press. Most cages will have a high bar suitable for chin-ups, if not one can generally be added. Similarly a dips attachment. An adjustable pulley gives you the added flexibility of a cable station allowing for pulls with resistance at different orientations (high, low, mid). With front racks, you can work outside the cage while still racking the bar onto it, much as you would with your bar stand. Bumper plates and a platform allow for Oly lifts, which are great for developing not just power but strength (you can do Oly lifts without these, but it's safer and easier on your equipment if you do have them).
An adjustable DB is just a bar, a set of plates, and a locking ring that you can set up for a wide range of weights, it's cheaper than buying a full set of DBs over the same range, and the manual ones will give more range than the adjustable DBs you can typically buy (usually 5-50# or so, not enough for the serious lifter).
A rope hanging from the ceiling for climbing is pretty minimal equipment. Kettelbells (even just 2-4 of a few weights) offer some increased variety to a workout, though most KB moves can be done with DBs.
A Concept2 erg is something I happen to like, and if I had my own gym it's what I'd want.
I could have gotten the cage, but it's larger, heavier, and takes up more space. Also, it's all I need. I didn't want to buy more than I wanted or needed. I don't need a cage to squat, clean, press, and chin. I went back and forth for a while, but those are essentially the only exercises I do. I have no interest in chains, bands, etc. This is fine and works for me. It's also cheaper, easier to take apart/together, and move to a different location if needed.
