When I purchased my FXIII Turbo in Dec '21, I chose that model for several reasons.
1. I wanted to future proof as best I could what I was spending this money on.
2. I did not know what I would be using on the unit and wanted to ensure that I did not limit myself from getting what I wanted out of it.
3. I was certain I would also be running my vocals through the Axe FXIII, so the extra horsepower would be to my advantage.
4. I thought the extra 10% price increase was a very reasonable charge for the extra power.
After a little over a year with the unit, I am glad I went with the turbo. My kitchen sink preset has been as high as 75%, but it is currently optimized and running in the 55-60% range. Great thing about that is, I still have room to add a second amp, or extra effects, extra cabs, etc. as I see fit.
As for headphones, I agree with the wired option for the time being. In the budget price range, I really liked my HD280's in the years gone by, but I rarely use them anymore as I have a few nicer options. Those options are Beyer Dynamic DT990 Pro, AKG K712 Pro (my favs) and Westone Pro X50 IEM. Looking to get a pair of Ollo's in the near future but those are likely out of your budget for the time being. Keep in mind that generally speaking, closed back headphones are for tracking, open back headphones are better for monitoring (while playing) and/or mixing. If you are not worried about the audio bleed (which you do not want when doing mic recordings), go with open back.
Best of luck and congrats on taking this step. The Axe FXIII is the greatest piece of audio equipment I have ever purchased!!!