That's a pretty broad question, since there are so many choices and considerations. I have a small hand-operated benchtop press, with a few dies I've had made, and it's worth its weight in gold if you ask me. It's great for smaller parts, say no bigger than 9"x9".
BUT, you don't necessarily have to have a press bed that's as big as your part to cut it. I can cut parts slightly longer than 9", by moving the die and the leather across the bed while making multiple strokes. A little more work than just one stroke, but still a lot less work than cutting by hand.
If you don't have enough to invest in a press that will do everything you want, you might consider getting something that will do at least some of what you want, then upgrade when you've made back enough to invest more.
There are at least a couple of topics here on this forum about how to modify a shop press (such as those found at Harbor Freight) to make it work as a clicker press. Texas Custom Dies also has 12-ton presses that they make (probably modified shop presses) that are reasonably priced.
Another thing to consider if you really want one of the big industrial presses, is whether you have a facility that can handle it. Many of them are very big, and very heavy, and require 3-cycle current. There are some smaller ones that don't require quite as much overhead, but when you're shopping for one, that's something to take note of.
Kate