Well /DNC+Haste Samba gives same DPS if I'm not mistaken, unless your at absolute haste cap which is unlikely as it was said before. Also Haste Samba would help the rest of your party as well which follows suit with how RDM supports they party. So /DNC would be a viable option as well. TP lost from Samba should somewhat be regained by the TP you are not losing off Haste vs the DW you get with /NIN.