I Need Help Finding The Best Router For Me!

[Bulletproof123]

As of right now, I have the RDK-B Telephony Wireless Gateway Modem TG1682G.
I regularly use it to stream TV in HD and UHD. My current plan speed is 75 Mbps, (On my phone and other speed tests I goes up to 300 Mbps for some reason.) I am using wireless for gaming. There are always around 13 or more devices connected to the internet at the same time, but most of them aren't being used at the time.
Here is why I want a new Router: Some of the walls in my house are very thick and the signal of the router I have now doesn't get through(One wall is concrete). I'm sick of my NAT Type being Moderate. My internet has recently been acting weird, and is giving my devices "limited access"( That's what my phone says when trying to connect to it, SOMETIMES) I'm also tired of me not being able to connect with other people I'm trying to play with online. All the devices are connected through wireless because, the gateway/router/modem is in the middle of my house and all the devices are in different rooms. What router do you guys think I should get?

PS. My house is bigger than 2,850 sqft, and I have 2 TP Link wifi adapters. Also, my wifi router doesn't seem to detect them as wifi adapters, but they still work.

 

[RealBeast]

No router will make much difference as the thick and concrete walls are the issue. Your best bet is to use a pair (or perhaps even 3-4) AV2-1000 or better powerline adapters. You can either get a model with wireless built in or add a cheap router set up as an AP.

Whatever you use on wireless will work better on 2.4GHz if far from the radio as the lower frequency allows greater penetration of materials in the way.

Best to put one near the gaming machine and avoid wireless for lowest latency results.

HERE is the best site for comparing the actual speeds of various PL adapters.