I have three recommendations, but two can be hard to find. The most likely option is the Guhong Pro+. My personal favorite is the Moretry Tianma Zcube edition with ballcore. Another good option is the SAOCube version of the Moyu RS3M v5 with ballcore and no UV (the UV makes this particular cube brittle and fragile, but it's fine on other cubes). All of them are slightly cheaper than your Gan 356 and much better value.