Did the same analysis myself and determined the Nikon 10-24mm f/3.5-4.5 was a good lens for me at this point of my journey to discover my visual voice (BTW: I shoot with a APS-C "crop sensor" Nikon D3300).
The lens is heavy and cost about $800 U.S. I tried it out for a couple of days and I would have packed it up and returned it for a refund if I didn't like it. While I found the 10-24mm lens had a difficult and steep learning curve, with effort it produced some of my best images ever, so it's a keeper
Most importantly, UWAs are not for getting more into your images. They are for getting your viewer right smack into the middle of the scene you are shooting.
You might consider reading my "Utra-Wide-Angle Lens Lessons Learned"
in the comment section here.
Click to view my images shot with Nikon D3300 / Nikon 10-24mm lens
Let us know what you decide.