Welcome to the forum
as you are discovering, a lot of friendly members willing to try to assist you.
my suggestions are a little different
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first I would urge you to spend a little $ you can do you own evaluation before spending more so
you live here in the US so you could contact one of the companies that rent photography equipment.
I have used Lensrental.com ( borrowlenses.com is another company, there may be more ). You select what you want, buy the protection plan you want, I recommend the highest possible.
what you chose is delivered to you and when the rental period is over, you just send it back. Lensrental uses Fed Ex as their standard delivery service.
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the other thing to consider is the size of the sensor on your camera and its effect on the field of view of the lens you choose.
As simply as possible, here is what you need to know, the field of view you obtain with any lens used with the APS-C camera body's smaller sensor is not the same as you would obtain with a full frame camera's larger sensor
so using a 21mm lenses will give you more of a field of view as using a 35mm lens on a full frame camera.
so to get the same field of view as you might expect ( you want a wide angle right ) you must use a wider lens not a 21 but perhaps a 15mm
these are just an example, and not designed to be exactly accurate
Full Frame Sensor vs Crop Sensor: Which is Right For You? Crop Factor Explained
I have both the 21mm Limited and the 16-85mm zoom and I like them a lot
the 20-40mm Limited has a good reputation ( it is a " Limited " after all )
I don't know anything about the other lens you are looking at.
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once you decide what you want, decide on new vs. " experienced " if " experienced " is an option, check out what might be offered at the forum's marketplace. [ " buy/sell" ]
I have had good luck dealing with various members selling their " experienced " equipment there.