Hmm, tried a couple more and seems that her skill damage output is still more than enough to keep you in lane without any boost to spell vamp. Removed Hextechs and bumped a Rod of Ages up to main build.

Dorans.. still not convinced.
+100 health -- you have spell vamp, you don't need a massive health bar early on.
+5 mana per 5 sec -- when you're rushing Tear of the Goddess as you do in this build, mana really shouldn't be a problem, even playing fairly aggressively.
+15 ability power -- We'll be rushing Archangels Staff which will give you a much nicer amount of AP.

personally I think that Doran's Ring is far too good on Morg too overlook. I also think you need to build AP on her faster than what you have listed, however, it depends on what type of role you want Morgana to fulfill if it's more a support role then I would understand. the Hextech Revolver is kinda random IMO you already have significant Spell vamp. Other than that I enjoy your build very much

+1

Okies, just wanted to highlight the fact that with her massive farming ability, Warmogs is a very viable option to take!

Thanks for the comments :-)

good, but confusing. please take out some of the situational items from the listed build... other than that, +1