The SP540i is the successor of the SP540V, should be at least younger, and the better choice. The 540i has technology to reduce banding in prints (intelligent pass control), what the 540V dont have. The 540i will do automatic environment match what the older one wont do (important for contour cutting precision). At the 540V Capping movement is electrical what could cause problems a SP540 with its mechanical system will never have. Because of thicker ink tubes and bigger Dampers, some Problems with ink flow will be avoided on the newer model.