hands down get a 4x4x4. because the 4x can be optionally just turn only in the halves making it a pseudo 2x2x2 cube, or, you could turn it in ONLY the crevaces that ARENT the half marks thus making it a pseudo 3x3x3. and you still have the 4x4x4 option yet too. Its a 3 in one cube!. You cant make a 2x2x2 cube out of the 5x one. 4 is the best!!!