The Invensense ICM-20600 (or 20602 - I’m not sure what the difference is aside from packaging) is the upgraded version of the MPU-6050 family of IMU’s. Personally I’m mostly interested in the gyro, which has 10x faster output rate and 3x better noise density than the L3GD20H. But the accelerometer looks very good too. There are a few products in the family that could probably use the same (or very similar) breakout boards.
I’ve only found one supplier of breakout boards (for the 20602), but it doesn’t include a regulator or level shifters for 1.8v.