I never made it throught Elfen Lied. I still have every intention to, because it seemed really good. But I started it right after watching Chobits (not recommending that one). And the fact that Nyuu only said "Nyuu", was too much to take after watching Chi who could only say "Chi".
But it did look good (the beginning was awesome).
I think my fav that I've seen so far is Ayashi no Ceres. The first ep was slow (and the heroine's eyes are way too big), but after that I loved it.
My second fav so far is Shikabane Hime. Absolutely AMAZING story. Terrible ending. I don't know if I should recommend it not. The story was interesting enough that I might even rewatch it. But the ending... Just giving you fair warning in case you try it out. It's a great show and a great story, but don't expect a great finale. (Unlike Ayashi, which had the best ending I think I've seen in an anime - everything really tied up, etc.)