Scott what I'm gonna say here most of the others gonna be against it, but as a friend have to put my perspective, because most people think that with a harmoniser they have the world at thier feet.

I have been using you Digitec for some time now, and I am very pleased with the SEMPLICITY and it's effect, if you go back to a thread I had, about my friend when he bought the TC Helicon.
In my opinion I don't think it is worth that much money for Digitech does a good job when I heard the Factory Presets of TC I wasn't impressed a bit always for the money it costs, we tweaked into it and it is not that easy to get use to, more complicated than the Digitech, if you are willing to wait a lot of time in setting it I think it will get you there, but you have to work very hard to get your liking.

I would like to suggest another way for you to record, isin't better to record your voice since you have a multi Track and transpose your voice ? it surely sound more natural because in recordings whatever Machine you use still sound ROBOTIC. So I will try first doing a second voice, you have a very high pitch and can easly do the job with no extra money spent.

I always say Harmonisers are good for live performance but for recording I don't like.

This is my humble opinion, but I felt had to feed it here.

Whateve you decide don't rush into buying.

Tony.