Best Omaha Book?

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I have generally stuck exclusively to 2+2 material, but there doesn't seem to be an Omaha book published by 2+2 besides the Hi-Lo one. Ray Zee's Hi-Lo book is also more expensive than the typical 2+2 book, focuses exclusively on Hi-Lo (not necessarily a bad thing, but I would like something that has both Hi-Lo and High only), and has generally bad reviews on Amazon. Is there anything else out there that is better?

I was planning on getting Seven Card Stud for Advanced Players, Mathematics of Poker, and one more...