If you are interested in getting a GAN cube, I would recommend the GAN 11 M Duo or GAN 12 M Leap. They're basically the more affordable options for GAN's two best cubes. The Duo lacks adjustment of the corner stalk magnets, and the Leap has springs instead of maglev in the core, but they practically have the same performance as the full-feature cubes.
The Duo and the Leap are still kind of expensive, but IMO they are the cheapest ones worth buying. You won't get that premium GAN feeling from budget GAN or Swift Block cubes, you'll just be overpaying for middle-of-the-road cubes, and I think you'll be disappointed.
What cubes do you currently own? I think the X-Man Tornado V3, Dayan Guhong Pro M, and Moyu Weilong WR M 2021 are more reasonably priced flagship cubes if you want to try something new.