66 Blues/148 rated= New Tionese (minimum for stepping into level 55 flashpoints)
DG/150 rated = A little better than the new tionese but obsolete, just something better to do L55 flashpoints with.
66 Purples/Basic gear/156 rated = New Columi (minimum for stepping into L55 SM ops)
Arkanian/Black market/162 rated= New Rakata (minimum for stepping into L55 HM ops)
Underworld/Verpine/168 rated= New Campaign (BiS and will probably be minimum for stepping into TFB NiM).
Despite the [Artifact] gear being better than DG, I think I'm going to keep 2 of my DG armourings for the set bonus - at least until I've got some Arkanian - decreased CD on my Innervate is something I'm used to.