What tonearms work with denon 103r?

Just received the 103r and it's still breaking in, but wondering how good can it get? I am using the graham 2.2 with some tweeks. It is too early to say but the grado circa $100 before the denon sounded better even though it was grainy. Should I add more mass to the arm? Not at liberty to spend a fortune on the arm just yet.