so i bought an m50 for 750 on this one site but the order got canceled and cant find it anywhere else cheaper then 920$'s roughly. Since i want a 73 key keyboard eventually does anyone think it would be a good idea for me to buy an x50 now for 590$ then upgrade later? if yes then what kind of 73 key keyboard do you think I should get later that would be a good upgrade from the x50? thanks