Should I get a Pimax 8k+, 8kx or 5k super? I have a 5k+ right now.

Basically the only difference between the 5k+ and 5k super is that it has 180hz, but with my 1080 i can barely even reach 144hz

The 8k+ seems nice

The 8kx only has around 90hz on native mode but even then I have a 1080 so I doubt i'd even hit 50fps