Buying used is a great way to go. However, it is inconvenient and cumbersome. Wait for the tool I need to show up and then try to buy it. Then I usually have to do some work to get it 100% operational.
As a hobbiest, I can justify the trials of buying used tool.
If I were trying to run a business, especially new business, the last thing I would want to manage is tool acquisition, setup and repairs. New at least provides the expectation that you will be able to focus your energies in productive endeavors.
Sheet goods are a real pain for me on my table saw. Breaking them down, squaring them up is a time consuming task. I would think a slider would be money well spent.
The band saw and drill press may not be necessary, or at the least you can find less expensive solutions.
As was pointed out with the shaper, unless you plan on lots of BF of custom profiled moldings, the hidden cost of the shaper may be a hindrance.
You don't mention bits, blades, clamps, bench tools and all the other little things required in virtually any shop. I assume these are already accounted for.
Measure twice, cut three times, start over. Repeat as necessary.