I'm building up a kona kikapu deluxe and I just got a new crankset and chain along with new front and rear derailleurs. I would like to not buy a new cassette but i've heard that it's best to just replace the whole drivetrain at the same time as to not accelerate wear. Is this true? Should i just pony up for a new cassette? Or does this cassette have plenty of life life (like i think it does)?