Well, the thing to remember is, you can choose non-humanoid base creatures and still have your specific character be humanoid in shape.  For example, the Blink Dog (http://www.d20srd.org/srd/monsters/blinkDog.htm) will get you some extra dexterity and wisdom, free action dimension door, at-will blink, low-light vision, scent, and +4 Hit Dice.  And you get to stay medium-sized and look like whatever you please.<br/><br/>...Hmm.  Actually, if you use a Blink Dog as the base, you could probably get some really cool powers with the right build.  I'm guessing you still want to be on Glyphstone's layer of the Abyss?