Thanks, I'll give it some thought, though I might also go for something like Close-Quarters Fighting (simple and useful) or Obtain Familiar (also useful and can help with scouting).

Planning for a possible future of the game, there's a feat and a PrC that I'm interested in picking up for this character concept, but neither is in the presently approved sources. The feat is Netherese Battle Curse from Lost Empires of Faerun - since piling on the debuffs is the focus of this character, this feat fits well and will affect enemies who are otherwise immune to mind-affecting effects or conditions like sickened. The PrC is Dragon Devotee from Races of the Dragon, which is a nice 5-level class with a quick return on investment.