That looks like a pretty good deal. At least on paper. ASUS is having a bit of a consumer care meltdown at the moment, so you may wanna check that situation out before you decide. (Search “gamers nexus asus”)

Should work fine, especially as this mainboard has Realtek ethernet (ASUS sets up Intel I225 ethernet in a way that can cause issues, see this post on Reddit).

Linux handles a 7800X3D in the ASUS TUF Gaming B650-Plus just fine, and since the motherboard in your bundle is almost the same, I would expect that to work well, too.

Some of the early BIOS versions on AM5 boards caused hardware damage if EXPO was enabled, and Asus was one of the affected brands. Updated BIOS versions with sensible VSoC limits have been available for quite a while now. I suggest updating the BIOS soon after you have your system running, just in case you get old stock. Rest assured that just booting up with default settings won't fry it, even if it has an old BIOS.

Asus boards are among the few that officially support ECC RAM, which is nice if that's important to you.

Asus warranty support for their video cards and ROG Ally have been particularly bad lately. I don't know if their motherboard support has the same problems. (I've never had to RMA a motherboard.)

I have a GeForce RTX 3070 which I will keep and I am running Linux Mint 21.2. Any thoughts on compatibility?

AMD GPUs are better supported and better integrated with linux, so you might consider one next time you upgrade, but the GeForce card you already have ought to work fine for gaming and basic desktop stuff (once you install Nvidia's proprietary drivers).

I have a Gigabyte B650 skew and I'm happy with it, I think the X670's are overpriced for general use tbh and the 7800X3D was my first choice but it was way too expensive where I live so I got the 7900x. I'm not sure if its still a thing but when I was buying last year, it was recommended to go with 6000 or lower speeds for AMD CPUs for better stability so that should be fine for you.

I'm in Europe so I can't comment on value because its completely different over here and also Microcenter is auto blocking me anyway lol

There was an issue with Over Current Protection on AM5 motherboards when EXPO is enabled that can cause the CPU (especially X3D) to die.

GamersNexus has a few videos on it https://www.youtube.com/watch?v=kiTngvvD5dI&t=0

So I would defintely recommend checking Asus's website to see what firmware version they recommend using and upgrading to that before anything else.

Are you aware AMD just announced the release of new cpus?
Just making sure, since some people will prefer to wait.

Honestly I could never recommend an Asus board. They've done some really shitty things as a company recently, but besides that, I've had like 3 of their boards to go bad in weird ways. I'll never buy one again.