Well now that Nvidia supports some freesync monitors you aren't locked down to just monitors with Gsync modules. Nvidia have a certified gsync compatible list but there are loads more freesync monitors that are working with gsync that are not on that list. However I think they are still subject to the freesync ranges (40-144hz) so as long as you are gaming at 40fps or more VRR will be in effect.
Unless you are short on space you could look at 27" monitors, there are far more VA/IPS monitors at that screensize. The only downside is at 27" 1080p will look soft due too low PPI, still personally I would go for a 1080p VA/IPS at 27" over a 24" TN panel anyday.
Here are two options I would look into seeing if they are gsync compatible:
ASUS VG279Q - 27" IPS 144hz Freesync
ASUS XG27VQ - 27" VA 144hz Freesync
Some Google sheets with freesync monitors tested with Nvidia GPU's:https://docs.google.com/spreadsheets/d/1YI0RQcymJSY0-LkbjSRGswWpJzVRuK_4zMvphRbh19k/edit#gid=1455257...https://docs.google.com/spreadsheets/d/1Ej9mOe5NamLldpfyFfXrqvLMZP-aG2Zi1su7QzPRNJY/edit#gid=0
The upside of all this is that the freesync monitors are quite a bit cheaper than gsync ones, you could be looking at a saving of 150-200 Euro, while still being able to utilise VRR....