I too have an 8DR with the GPS and stand combination. I ran this for a while, but when I started clipping the radio to my backpack, I picked up the speakermic, which is a very nice unit. I wouldn't say it's clunky, and has a very nice slim profile.
I'll say that if you don't get the GPS, you should have just bought the VX7, so you HAVE to get it
I have the BT kit in my Yaesu FTM-350, and don't use it as much as I thought I would, though it is nice when the YL is in the car and doesn't want to hear radio stuff.
While you're at it, you'll want to pickup a larger battery like the Yaesu 1800mah one or
this 2000mah version from Batteries America.. And like the rest of us, you will likely hate the clip that comes with this radio, so you'll end up wanting the spring clip from the same link.
Congrats on a picking up a GREAT
moneypit radio!