Well, one thing I must say about the Yeti is that it is HUGE. It's as big as an old-fashioned analog studio mic from the 40s, so it's a lot to lug around. There may be something else that would be smaller that would do as well for your purposes, since you don't really need a full-range mic for spoken voice. This thread in the DAW support forums has info about many different mic options:
http://forum.harmonicdog.com/viewtopic.php?f=2&t=6
I am very pleased with DAW for basic recording, but I've actually only used the full quality settings. It does allow you to choose either ogg or aac compression for emailing (in addition to full-quality wav) but I don't know how much that compresses things--to get a file that size small enough for easy emailing is going to take a fair amount of compression and I don't know how that would affect perceived quality.
For voice there are a lot more options than for tricky instrumental recording. Harp is one of the most difficult instruments to record well, so options are much more limited than they are for voice or something like guitar where there are plenty of apps focused on those.