Very slim pickings now as the recommended 2019 models have sold out leaving a mix of overpriced 2020 models, and TVs from 2019 that aren't recommended.
If you can buy at a later time it would be much wiser, I'd recommend Black Friday 2020 for the first time to see some good deals, but possibly spring 2021 to see the very best.
As for a TV used for gaming. Its a bit more complicated than it once was. The good thing is almost every TV you buy today for gaming has low enough input lag. Gone are the days of worrying about input lag on TVs being higher.
The bad thing though is really with HDR. Most games now are made with HDR and to display HDR you need to spend a lot more money on a TV. Cheaper TVs that have HDR on the box cannot display it without problems. At least though, for those who can't afford to spend more money on a capable HDR TV (usually at least £900-1000) you can still turn off HDR on the console and play games in SDR.
The other thing to decide on is panel type. With a limited budget you have to choose which strengths and which weaknesses you prefer. Decide based on your own personal preferences, but also the location and conditions you use the TV in. A general rule is to shop for a TV using an IPS panel if you like the picture to look good during the day and with lights on, and you play fast games and want the least amount of motion blur. IPS panels also have good viewing angles.
But on the other hand, if you want a TV to play when its dark, or dim and you don't feel you mind motion blur that much, a TV using a VA panel is going to give you very good picture quality. VA panels have poorer viewing angles and must only be viewed directly in front.
See
Which panel type should I choose for my TV? for more detail and to decide.
My advice is to decide on the type of panel before picking out TVs.
From richersounds.ie this is best value right now for VA:
55 inch 4K Ultra HD HDR Smart LED TV Freeview Play
euro.richersounds.ie
and this for IPS:
55 inch 4K Ultra HD HDR Smart LED TV Freeview Play
euro.richersounds.ie