Are there any features that IHO has that I'll miss with Harmonia 2?
Pretty much every option is still there unless you compare it to Jerrry's which has a lot of teaks for the interface.
I did donate $20 to blarf's efforts here. If I end up liking Harmonia 2 I'll do the same to LeslieAnn.
Glad you like it.

It shouldn't be a radical departure from IHO roms in general, just a bit stripped down is all, and includes some basic Gapps to get you running easier and faster.
I don't do the whole donation thing, if you want to, I recommend donating it to the IHO team, or Mrg666, since he provides me with the basics for what I build. It's all IHO though.
every time i reboot the phone, it reimages itself with a fresh version of the OS.
I have heard of this before, but I haven't seen anything on how to fix it, but here is what I would do...
First get a fresh copy of the rom you want and do an md5 check on it (from the sdcard).
Now do a nandroid backup and then re-flash your recovery, as always, I recommend Bobzhome since it works well on all phones. Then I would make another nandoid backup (one before, and one after on recovery changes!). Now wipe everything except the sdcard (factory style, boot, system, and dalvik), and re-flash the rom.
Change a few settings and apps, then restart, see if it messes up again. If all seems well, go ahead and re-install everything you normally use. If it starts wiping everything again, then it's an app you are using or a script, but unless you start clean and restore things in stages, you won't find the problem.
I reinstalled due to freezing problem once while. After reinstalled and left off the Green Machine stuff. So far it stable, but where's my navigate app?
Navigate is part of Google maps, older versions don't always contain it. Uninstall Google maps, and download a fresh copy, that should fix it.