I like both.
Natasha has a bit of a harsh sound, though, and I really dislike the possibility of her being called
Tasha. I have a co-worker named
Irina, prn. ee-REE-nah. I always thought it was EYE-ree-nah or eye-REE-nah, and she says people almost always say her name that way, but she just politely corrects them. :b