How does my Vladimir build sound?
Build order:
, 
( If I go mid ) OR
( If I go top )
,
,
( If 3 or more AP ) OR
( 3 or more AD ) ,
,
OR
( If they built MR ).
I looked at Vlad Maine's recommendations and came up with my own.
This build gives me full CDR and some defensive stats as well. The reason I don't like Ionians is because defensive items scale better than any given item with only purely offensive stats. 25 MR or 25 Armor gives more than 15 magic penetration for example. Vladimir is also a champion that suffers from a weak early game that makes surviving lane more important than winning lane.
Building Rabbadon as a third item may seem strange, but personally, I believe it's worth it considering he scales better with AP than health.
As for building Banshee's instead of Spirit Visage, I believe the latter is the better purchase because SV doesn't offer any form of AP which is similar to what Vlad Maine prefers.
(Optional if against heavy AP
) alternatively you can go