I like the center knurl. It makes the bar feel solid on my back for back squats, even at the 135-185 ish lb weights that I'm using. My impression is that weightlifters don't like the center knurl against the throat for cleans, front squats, etc. But I think I'm OK with that.
I found another bar that is zinc oxide and has the center knurl:
https://www.roguefitness.com/rogue-chan-bar
I think I might do this order shown below minus the last item, the 300 lb black training plate set, which is the big ticket item. The plate set ships for free anyway, so I wouldn't miss out on the free shipping to wait on the big plate set. And I just really can't decide if I want to get those plates or the Rogue HG 2.0 Bumper Plates... or even just go with cheap plates from wherever. The nice plates shown there would take me up to 400 lb in increments of 5 lb if I get the change plates listed, for $1,136. This is the set with 4 45s (blue stripe), instead of 2 45s and 2 55s (red stripe) (320 lb set); I worked it out on a spreadsheet and I think the set with 4 45s makes more sense. The 350LB HG 2.0 Set would take me up to 410 in 5 lb increments with the change plates shown minus one set of 10 lb which wouldn't be needed, for $700. Worth an extra $436 for really nice plates? That's a lot. What if I want to expand further, would I want to be committed to the nicer plates? Will the prices go up? Would one or the other be easier to store, stack, move, load/unload? Would I just enjoy lifting more with really nice plates? These are the things running through my mind...
And yes, I'll have access to a gym for the foreeable future. I'd like to have a home option for when it's not convenient or when they are closed, and possibly to train people. My husband plans on building me a workout room when we build a shop in the backyard, hopefully in the next year or two, and I might wait on that to even unpack whatever I get. In the gym when it's built, I'd like to eventually have a rack, bench, pull-up bar, stall mats, and
Sprossenwand . And of course the kettlebells that I already have, plus perhaps a few more.
Thanks everyone for your great inputs so far, it has helped a ton!