I'm going with an Abishai 8/Bard 2/Ur-Priest 3/Keeper of the Cerulean Sign 7. Basically a fiend Ur-Priest specialized against aberrations.
Knowledge Devotion to pick up Kn (Dungeoneering) as a class skill helped a lot, but I still have to burn more skill points than I'd like meeting cross-class skill prerequisites. I don't even have the skills to spare to pick up enough Perform ranks to use Inspire Courage. Maybe if I can afford to buy an Intelligence of 12...
I also need to think about a flaw or two... Skill Knowledge would help a little bit...
I guess I've got a question of how oslecamo's monster classes work... Do you have to finish the monster class before you can multiclass into other classes, just like with the WotC monster progressions? I'm assuming so, but the Abishai one is odd, in that you change abishai types (white, black, green, blue, red) as you progress through the class. I know I have to start as an Abishai, but can I leave, then come back?
Ah, I found the answer; it appears I can:
Do I need to take all the levels or can I just take what I want and then go to other class?
Just like a normal class, you can leave a monster class at any level up and then even come back later if you wish. You aren't suposed to mix diferent monster classes togheter however. Do it at your own risk. I created a couple feats here that allow you to multiclass between monster classes.
That will allow me to start with one level of Abishai, take a flaw to move one of my other feats forward, then take Bard 1 at 2nd level, and take
Skill Knowledge at 3rd level, and put my Abishai skill points to much better use. Now to choose a flaw...