You did not mention the table that this will go...but here are some general comments. So far I have used the VPI JMW 9 and Rega RB300 and RB600, but all the mentioned tonearm have gotten good comments from users.
The JMW-9 signature is a little on the low end of effective mass needed for the Denon DL103R. Adding a 2-3g headshell weight should help. It is a very nice tonearm especially when used with VPI tables. It does have exchangable armwand, although for the signature version they can get expensive.
I would second also the suggestion to look at other arms, Moerch DP-4, Hadcock tonearms, etc. The Moerch is very flexible tonearm, with different effective mass arm tubes available. It can be matched ideally to any cartidge. The Moerch would be my joice for my next table.
Good luck with your search,
Rene