V3 RAZR vs other Motorola

I'm looking into switching providers, and am leaning toward one of the
Motorola phones, as the sound quality has always seemed better on them
vs other phones I have had. I currently have a Samsung A600, and am
not overly thrilled with it, as the reception isn't overly clear or
loud.

What I'm curious about is how the V3 compares to the other Motorola
phones (e.g. V551, V635i). Is there anything that makes is "special"
and more expensive, other than just how thin it is? From my
understanding, both the V551 and V635i have all the same features, and
the V635i has alot more memory and features. Just wondering if the
RAZR is still worth considering.

I am more after sound quality and volume, than gadgets (mp3, camera,
etc.). I've found the camera on my Samsung to be completely useless. A
way to sync with my computer for phone numbers, etc. is a must, and it
would be nice if I could actually transfer files that way, as well,
rather than having to do everything via email or through the provider
web site. I am really interested in the Blue Tooth capabilities such
as wireless headset, car kit, etc. What is the general experience with
BT accessories? I have heard that there are still a few "glitches" to
work out.

Any good, bad, or ugly experiences you want to share regarding the V3
or other Motorola phones... or even a recommendation of any other
phone I might even like better?