I also voted a 9 since casting Chained GMW at level 18 basically covers every item in the party and then some (even with a party of 7). Then I am desperately waiting to cast my Chained Finger of Death with a 41ish fort save. Did not think about the Chained Targeted Dispel Magic use but I am definately going to keep that in mind.
Thank you for that lovely suggestion, and then there is that Chained Polymoprh Any Object which happens to be a WILL save ( I believe ) which will do nicley for my fish tank.