I say TAL-i-tha, very similar to
Tabitha.
Tali is very pretty. I don't think it's at all too close to
Lolita or
Lalita even with your pronunciation, the T is a much stronger sound thank an L.
Annabel doesn't seem too common at all to me. It's rising but it's still only ranked 722 in the US. I think alot of people would spell it
Annabelle right off, but it would be a pretty even split. I do the same emphasis thing you do a little, but mostly they sound the same to me.