King Arthur Books

[Rosmerta]

Does anyone care to recommend a King Arthur book that'd make a good 
read-aloud for a 7-yr-old? He can handle fairly sophisticated stuff 
(he's heard all the HP books twice now and is reading SS by 
himself....one.....word...at...a....time) but IIRC The Crystal Cave 
is too complex (isn't that the one that tells Merlin's story, but 
backwards?) I remember reading--and loving--The Once and Future King 
but can't remember how old I was or how complex it was (wait....maybe 
*that's* the one that goes backwards?) Any suggestions much 
appreciated. 

~Rosmerta
whose memory has always been rotten; this is not an age thing!