Audiovox PPC-6600 / PPC-6601 / XV6600 (HTC Harrier)

OK, so I am a college student, and also in charge of my own business and a rather busy schedule. I really like the idea of a pda/cell phone, however, I am still a bit wary of something this big. So my question is this: how does the size of this affect your usage? Is it rugged enough for me to carry around in my back pocket, like a normal cell phone, or is it just to fragile and bulky?

I am comparing this right now to a "LG VX-8000," "Audiovox CDM-8900," "Motorola V710"

Any input?

Please reply soon, or email me at "surfer349@yahoo.com"

thanks,
Adam