I really liked the setup of my last two parties and they got me amazing exp, so I put them:

RDM/WHM (me)
BRD/WHM or NIN (both worked well)
WHM/SMN
PLD/WAR or NIN/WAR (both were good, although the PLD was wearing a Bomb Queen ring and we were at Mamool Ja staging point)
DDx2

One of those parties was short but went fairly well while the other one was a little under five hours long and got me just under 6 merits. We had 5 people for a lot of the time in that one though because of members having to leave and waiting on/finding reps.