Groovy Broovy, IMO if you're limited to 24", I wouldn't go 4k myself at that size, and also the fact that playing AH in 4k, the targets are VERY small, even in 2k/1440p, I find them a lot smaller. If this won't bother you, the game looks fantastic at 4k though.
144hz is another thing, absolutely do NOT settle for a 60hz monitor, get a 144hz, or at least 100/120hz. Asus makes a great 24" 144hz monitor, while a bit dated now, is still selling well for Asus. I ran 3 of these for 2 years. VG248QE, not sure on the price in Her Majesty's Royal Amazon.
Not sure on your system, if you have an nVidia or AMD video card. If you have an nVidia card that is capable of Gsync, I would spend the extra and buy the Asus ROG Swift 24" 144hz Gsync monitor, PG248Q . It's very new, all the ROG line was 27" (I have 2 of them, one IPS and the first one they released with is a TN-like panel), and a 34" one ( have this too). The 24" was made at the request of a lot of Esports players as many prefer playing pro CS GO on 24 as opposed to larger.
So, if 24" is your size, those 2 are the best options IMO. There are other 24" 144hz from BenQ and others which are great too. The model USVI linked was on display, refurbs at my local PC shop, for only $150USD, great deal, and a great 144hz. Just do NOT get a 60hz, you'll immediately see the difference running 144fps over 60fps. I'm not sure this is a good idea for the MA, you're already too good and making you more lethal sucks the pills for the rest of us.