I really like the name Aasimar. Its a good name.
It just really doesn't say "half-divine" to me. If you said that name to me and asked me to figure out what kind of race i'd associate with it i'd probably pick our some half-effreet or maybe a cat person or something. It took me a long time to accept it as meaning "decended from divine", and about 5 seconds to forget i'd accepted it. Deva works, it makes the right connections in my brain. Its not half as cool of a word as Aasimar, but its a better word for the job.