If you're not planning on transporting and shooting remotely, AutoPoles, a cross bar and super clamps with U-hooks work really well. It's very stable and will support multiple backgrounds at one time. The cost is not much different than what you've looked at above.
Those look like pretty solid components to me if you're moving around. Maybe a couple sandbags if you thought it wasn't as stable as you'd like but seems like a good choice.
