That Wysong secetal has looks pretty nice, and Wysong made good stuff.
When you mention things like shelves or boxes, you need something with a bed that's longer than your max length. The first two sides of a box, for example, can be formed on any length punch and die so long as its long enough. But the other two sides have to be formed using a punch no longer than the length of the sides you're forming.
Having a bed longer than the minimum allows you to leave your longer punch and die in place and have room to install a shorter punch and die set as necessary for forming the final bends on boxes and similar work. One man can easily install a die set that's 18-24 inches long, but if you have to remove a full length punch to install a short one then that's a two man job.
One other thing you need to decide is whether you want to bottom or air bend. Bottoming requires a lot more tonnage. From past experience, I'd bottom the 18 ga stuff but I'd air bend the 11 ga and quarter inch materials unless there's some specific need to bottom the 11 ga.
You're unlikely to find a press brake in the used market that comes with all the tooling you need. People either keep the tooling for use in other machines, or they sell it separately as punches and dies are a much easier sell than the brakes themselves.
Since you mention forming channels, you should look for a gooseneck punch as it allows much more flexibility in forming bends that are close together without the previous bend leg striking the face of the punch as it often can with a standard punch. A gooseneck will function the same as a standard punch while also allowing you to form shapes like small channels, so you wouldn't need to buy both types.
Don't know what kind of shop you operate, but if you have decent milling capabilities, then you can make a lot of smaller dies as necessary for now and then use from mild steel like 1018 rather than spending a ton on a commercially made die. I've got a set I made for forming a short legged channel with 1/2" radius from 11 ga. I've formed over 2000 parts (4000 bends) on that set and it shows no wear. Took about a day and ~$100 worth of material as opposed to a quote of $2800 and 2 months delivery time for a commercially manufactured set.
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