I’d get this board before that b760 I think. Better chipset and less money.
I think the one above is the micro version. Looks like the full size one is the same price.
I ran an asrock b350 board for years on my old ryzen system.
Looks like Amazon burned through their stock, they did have the 12600kf for $140. I’ll put the link below but I doubt you want to wait until February. I was able to grab one last week while they were still on prime shipping.
At this point get the 12600k imo. May not want to wait though as it’s anyway showing delivery for Thursday December 7, so they may be getting low on stock. Might check Newegg as well. Just actually checked on that and it’s looking like most places on pcpartpicker are pretty well out of stock on this one, so if you are going to get it move quick. Alternatively drop to the 12400 for less or spend extra for the 13400 which is fairly close to the 12600k but is priced For 200 unfortunately.
On graphics card, id consider the rx 6600 over the arc a750. Intel is getting better for sure with drivers but amd is a bit more proven there unless you can get an incredible deal although here’s an Rx 6600 under 200.
Used isn’t always ideal but to shave some money off build costs, you might look on eBay and consider a used rx 5600xt. If I recall they are pretty close to the rx 6600. Here’s an example for around 125.
Up for sale is this XFX RX 5600 XT Raw II Pro GPU.
www.ebay.com
Though if you look I think you can find the rx 5700xt for not a lot more. You don’t have to go that route, just might be worth looking into considering the budget. Just watch the sellers feedback and the description. And be sure to run the cards hard as soon as you get it, I think eBay offers 30 days for you to return it even if they say they don’t accept returns.