It would be the i607, which I currently own. Because well, it is slim and cool, yet it still does everything I need it to. It is slimmer then the Razr, yet does WAYY more!
The next would be the Blackberry Pearl. I liked the form factor and its coolness. But I didnt like the pricy BB plans, non-qwerty keyboard and lack of 3rd party applications.
The 3rd would be the V3c because it was (when i had it) the bestest, coolest phone for Verizon. It just worked.