Depends on what you want. The Aikido & the Dynamic Sphere is pretty good. If you like reading about things from another persons view, Dave Lowrey has a few books compiled of his essays he has written over the years. Also, The Book of Five Rings is decent as well. I haven't read it, but some people say Angry White Pajamas is worth a read. It just really depends on whether you want an instructional book, inspirational book, history, etc.
As a member of Bluhm Sensei ' s dojo I would have thought you would have mentioned Sansho as an mag of interest.As far as Dvd is concerned all material gleaned from USAf /British Birankai seminars [especially ones conducted by Chiba Sensei] are an incredible source of Aikido material.
I would be grateful if you would pass on my best regards to Bluhm Sensei , Robert /Christina Needleman . We are old friends.
Best Regards, Joe.