I've had the CCS manga (in Japanese) for a while and had flipped through it, but hadn't ever sat down with a dictionary and read it before. And it's been years now since I saw the anime so there's much I'm forgetting - it's fun to go through again (even if there's so many things that are, umm, kind of creepy out of the super-cute context? like Sakura-chan's friend dating the teacher at ten years old ^^;;;;;)

I really quite like Holic, but given CLAMP's track record finishing series, yes, waiting for it to finish before reading might be wise!