Well, seeing as several of your abilities don't function when you're wearing armor, I'd suggest Bracers of Armor to make up for the lack. With 16th level starting wealth (I'm assuming that's what you have to work with) of 260000 gp, I'd say go ahead and get the maximum, +8 Bracers of Armor. +6 Headband of Intellect, too, to power up Insightful Strike and Canny Defense. Hmm, that leaves enough for a +5 Holy Ghost Touch rapier
. But, I don't think you should really spend that much (128k) on a single item even if Jack would allow it.