Just a few things of note if someone hasn't mentioned it yet:
- Your biggest issue is your choice in motherboards. I strongly suggest you wait. Understand these are all still 1st gen, and tons of issues are already coming to light, and not just BIOS issues either. I say wait a couple of months before making the leap. As for brand, I have never had any issues with Asus or Gigabyte boards that a BIOS update/restore couldn't fix. But between the two, I prefer Asus' apps and UIs. I did have issues with MSI (2 boards) and Asrock (3 boards) that were so bad I will never use their motherboards ever again. Not even sure why I gave Asrock a third chance
Then again, not everyone has the same experience with these products. But there's nothing wrong with sticking with a brand you trust.
- The NH-D15 is notorious for being too large for most cases, and for not having enough clearance for a lot of different components (such as RAM sticks and heatsinks) on several motherboards. As for AIOs, the pump and the fans are what make the difference, and the well-known brands are all pretty much the same nowadays. EK, ARCTIC, Deepcool, Thermaltake, Corsair, etc.. they're all pretty on par with each other for AIOs. But the BE QUIET! Dark Rock Pro 4 and the Deepcool Assassin 3 are amazing air coolers.
- One of the things I really don't care for in the Meshify is, well, the mesh. It's too flimsy and easily damaged -- hence Fractal selling just the front panels as well. Honestly, the Fractal products I've come across all feel like they're going to fall apart. Never encountered a Torrent though, so I can't speak to that particular case. I currently have the Phanteks Eclipse P400a with the mesh front. They say "mesh" but it's really a solid piece of sheet metal that's been perforated. Thermals and acoustics are great, and the build quality is solid.
- With the Strix 3070 you're basically paying extra for great RGB. The Asus TUF versions cost less, and the thermals, power consumption, and noise levels are the same. For better noise level, the MSI Gaming X Trio is the quietest by all accounts, with thermals and power consumption being on par with the Asus lineup.
- As for your choice in sound cards, there is no real difference between the Strix SOAR 7.1, Strix RAID PRO, and the Strix RAID DLX 7.1. In fact, there's really not much difference between those 3 and the Asus Xonar AE 7.1, except for the card shroud and (with the DLX) the volume controller. Everything about the Strix sound cards are a gimmick aimed at gamers. If you're dead-set on a sound card and want to stick with Asus, get the Essence STX 2 -- it has an amazing DAC and gives you a truly immersive, near-audiophile listening experience. It's the same price as the Strix DLX with far better audio. As other options, the Sound Blaster Z SE by Creative and the EVGA Nu Audio are also great, and are easier on the wallet.
- I can't speak to DDR5 RAM as I have no experience with them as of yet. But as I mentioned in regards to motherboards, I suggest you also wait a little while on this. Supply is only currently limited but it won't be for long. Once there's more options available and the products are on the shelves, the prices will go down. As is always the case.
Anyhow, that's my 2 cents. Overclockers is a great resource for anyone at any level, and I love popping on here to find answers and solutions. From what I've read in this thread, you've got some items pinned down, and a few you're still considering. But since money is not an issue, and you're ready to make the leap, then go with whatever you want and have fun with your build! Cheers!!