Tolkien's Legendarium is an excellent book - if you've read HoMe. If you haven't, you'll probably still find it interesting, but you won't be able to fully appreciate it. As Child of the 7th Age points out, it is something of a scholarly tome.
My advice is to stay away from David Day. I have his Illustrated Encyclopedia and, though some of the artwork is nice, the actual entries ranges from slightly misleading to blatantly inaccurate.
Letters is a good choice. You'll definitely enjoy that.
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