Tested some cornercombos and the best one so far is:
cl.C, df.B, dp.D DC qcb.D, qcb.D, qcb.B, super_ex super
570 dmg with regular super, 630 with ex. Builds 90% bar. IMO this is the best cornercombo so far. The 10% extra meter gain on the reynald combo is not worth the added difficulty (tho it looks sick ^^). The only "hard" part about this one is that you have to delay the dp.D a tiny bit.
EDIT: forgot to post, dp.B hits so late that you are in the air once the DC window starts. Hence you can only DC into air specials.