My ancient solid welded Target is probably better than any of them
and so is Sound Anchor IMO. Hard to find used, but reasonably priced to have made, considering their "last forever" quality. If desired, the Sound Anchor component stands are sturdy enough to put on heavy duty castors so you could roll the whole rack and system out of the closet for cable changes, etc.
I want to move the equipment into the closet
If cost is a big issue, why not simply nail shelf supports to three sides of your closet and use them to support DIY shelves of your choice? There would be many options from simple plywood shelves to plywood/mdf sandwiched shelves or, if you want to go all out, you could concoct a constrained layer shelf using a sandwich of black gatorboard, mdf and aluminum (sort of like the Symposium Svelte Shelves). The shelves could be permanently anchored to the supports, which would be screwed into the wall studs, thereby using the framing of your house, and not the more flexible floor joists, to support your system. I suspect the result would be quite sturdy. By leaving a couple of inches (or more) of space behind each shelf, you could more easily manage cable runs.
My point is, if you can't afford the quality you want, why buy something of questionable stability/quality, when you can construct something better to meet your needs?