I really enjoy Enchanter / Wiz / Mage with these mercs: Healer / Wiz / Wiz
With the mage you get great pet tanking, coh, some so-so dps, and some mana regen (mod rods) - I use the mage as role "pet tank" and use the servant to break mez. Pretty much set it and forget it. You could however, use pullerpettank role in some places, though the enchanter is a better puller.
With the enchanter you get a great puller, CC'er, slower, mana regen, runes, and boosts to direct damage casting (Chromatic haze, plus the one they are adding with EoK expansion) - I actually play my enchanter and chain pull to the group. I get them all debuffed and wait for the mage to take them. The enchanter requires a bit of work to be able to take a few hits while you get them mezzed. Get lots of AC and AGI and work defensive, then you can pull and even tank a bit if the mage pet dies for some reason.
With the wiz you get ports and let's face it, DPS!!! You also get snare and lower element that enhances the other casters. I keep them with the mage and sometimes us AFNUKE2, but it's a bit buggy and I like the "merc assist" feature in the kiss set up.
Using the mercs you just put the wiz mercs on burn but use the kiss "merc assist" feature in kiss to start nuking around 98% or so.
Let us know what you decide.