I'd have you consider taking just a single level of Demonbinder on top of a high-level Eldritch Deisiciple, if you can. A Lesser Drow is +0 LA, and the fluff states there are Demonbinders from other races, they're just shunned, and you don't even have to be Evil, you can even be CN.
Taking just a single level grants you all the important class features, assuming a high CHA - meaning you get an at-will source of Temporary HP, True Sight at-will, Fly at-will, The ability to grow 4 more arms (!) and quite a few others. Well worth a single CL drop.
Demonbinder =>
http://www.wizards.com/default.asp?x=dnd/ex/20070430a&page=3