The Dell UltraSharp U2717D is essentially a bigger version of the UltraSharp 24 U2417D, but it offers a higher Quad HD resolution with slightly better pixel density, and I find that both make a noticeable improvement. While the 24-inch model is nice, the 27-inch is a little sharper and gives you a nontrivial increase in display area while maintaining the same level of performance.

Dell sells the U2717D for $570 (£700, AU$850) with the standard arm, but you can find it for closer to $450 (£500, AU$650) which are far more reasonable prices for its features and specs. You can also get it with the arm I liked when I tested the U2417HA for $630 (£710). Dell Australia doesn’t seem to sell it with the arm option. Note that the U2717D sounds very similar to the older UltraSharp 27 (UP2716D) but that model is the one with a more color-accurate panel and 100 percent Adobe RGB coverage — the “P” in that model name stands for “PremierColor” — along with the higher $900 (£855, AU$1,160) price. Don’t buy the wrong one!
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https://www.cnet.com/reviews/dell-ultrasharp-27-u2717d-review/