OP, my head-fi journey mirrors yours, but in reverse. Hopefully I'll have the HD650 by next week but the anticipation is killing me.
It must've been one of those priceless Kodak moments when I first heard my Fun (like when I first heard the MS-1i). I'm sure I had a stupid grin and numerous aerial fist pumps were thrown. I'm anticipating the same experience with the HD650 based on what I've read.
Good call on going for Earth and Moon as well, the added versatility is worth the small expense. Please post impressions here when the Fun (the Awesome as I refer to it) arrives.