Well... I Guess...Well... I guess... I get the following phones in this order to "complement" the HD650s: AD2000s, RS-1s (or RS-2s, SR225s), HD580/600s ("new" version).
If you can't increase your budget for your amp above $300 (to get the DV332)... then... I'd get the Meier Corda Move / 2Move (great with the HD580/600s - s/b w HD650s also).