I noticed you have Intellijel (love them) Quad VCA, which has great additional features of boosts, individual attenuator pots, etc, WMD makes a real interesting Triple Bi-polar VCA. I don't think you need more VCAs like that. Maybe not as simple as the A-130-8v from Doepfer, but just some extra VCAs that allow you to take advantage of all the power you already have. Oh and along with those VCAs some LFOs, maybe throw an øchd in there :)