
GL.iNet
GL-MT6000 (Flint 2)
OpenWrt king, great value, but no 6GHz Wi-Fi.

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asus ax1800hp v2, cheap and consistent
I use the ASUS RT-AX1800S. Only 70.00 on Amazon
I'm not a fan of Netgear routers. They'll do in a pinch, but in my experience break within a year or two. I recommend ASUS Routers, this one is the same price - [https://www.amazon.com/ASUS-AX1800-Router-RT-AX1800S-Subscription-Free/dp/B09M9477NS?crid=JINVSXHS6QRH&sprefix=asus%2Caps%2C148&sr=8-1&ufe=app\_do%3Aamzn1.fos.9fe8cbfa-bf43-43d1-a707-3f4e65a4b666](https://www.amazon.com/ASUS-AX1800-Router-RT-AX1800S-Subscription-Free/dp/B09M9477NS?crid=JINVSXHS6QRH&sprefix=asus%2Caps%2C148&sr=8-1&ufe=app_do%3Aamzn1.fos.9fe8cbfa-bf43-43d1-a707-3f4e65a4b666)
Yeah I've been running the RT-AX1800S for about 8 months now and it's been rock solid. The web interface is way better than TP-Link's garbage too, actually lets you configure stuff without wanting to throw it out the window
Any router you buy for home Internet will have a firewall built-in. You seem to be under the impression that a firewall needs to be bought separately. This is not true. The R605 is a wired only router, so you will need something to provide WiFi as well. I suggest for your apparent level to just get a typical all-in-one home routers, like a typical ASUS or Netgear. Make sure it's at least WiFi 6 (AX) and within your budget, and it'll be fine. I usually recommend this as an affordable model: https://www.amazon.com/ASUS-AX1800-Router-RT-AX1800S-Subscription-Free/dp/B09M9477NS/
I would definitely upgrade the router first. It is ancient and, as you've noticed, capped by its 100 Mbps Ethernet ports. Any modern WiFi 6 or better router will run circles around it. If you're generally happy with the coverage of your current router except for the speed, then this budget ASUS model is affordable and far superior to what you are using: https://www.amazon.com/ASUS-AX1800-Router-RT-AX1800S-Subscription-Free/dp/B09M9477NS/ If you want to invest a bit more to get something in the mid or upper tier, by all means do so. But since your gaming consoles and PC are wired in and your WiFi usage is just Roku and phones, that budget model will be just fine too. I like ASUS for all-in-one router models. Without changing modems, you should be able to hit 300-350 Mbps by just changing routers. Whether or not buying an expensive modem is worth it to get that extra bit of speed (to 400 Mbps) is up to you. I personally don't think you'll notice. You can also check with Xfinity to see if they will give you a modem free of charge. They might give you a modem / router combo unit that perfectly fits your needs and you don't have to buy anything. As long as they do NOT change a monthly fee, it's worth trying. If they DO change a monthly fee, then proceed in using your own equipment exclusively, starting with the router upgrade, and then seeing if you need a modem upgrade at all.
asus is usually solid. had the rt-ax1800s for a while, no issues. firmware updates keep it secure. worth a shot if you're switching from tp-link.

GL.iNet
GL-MT6000 (Flint 2)
OpenWrt king, great value, but no 6GHz Wi-Fi.

Ubiquiti
Dream Router 7
Advanced management, good coverage, but Wi-Fi 7 range limited.

Ubiquiti
Dream Machine Series
Comprehensive control, reliable, broad coverage for large properties.

Ubiquiti
UniFi Express 7
Affordable UniFi entry, scalable, but complete setup is costly.

GL.iNet
Beryl AX (GL-MT3000)
Travel king, versatile OpenWrt, but bulky power adapter.