I find it funny that people will base their entire opinion of a gun on "how many times I've seen it at the range." Sheesh. I'm sure that my little P7 is not seen very often at the range, but everywhere it goes, people go "Oooooooh" and "Aaaaahhhh," when it comes out of the case.
As far as the SIG Pro is concerned, hold one. For a polymer gun it doesn't feel like plastic. I don't know how SIG did it. Hold a Glock or an HS/Spring. XD and it feels like a Mattel toy. That is not to say that they are bad guns -- quite the contrary -- but the Pro just feels better to me. The trigger on the Pro is an engineering marvel in its own right. You won't find a smoother trigger out-of-box anywhere. Couple that with SIG reliability, accuracy, and shear sex appeal and you've got a winner. (The decocker loosens up with break-in.) BTW, I've seen them go regularly on the Internet for $440, so the "big mean price difference for the SIG" is a load of crap.
Pay the extra $40 bucks.
I will concede, though, that the lack of "high"-caps (read: standard caps) for the Pro is a real drag. It would have been nice if SIG would have made the gun use the 226 mags. I would personally be inclined to get the Pro in 357SIG, that way I wouldn't feel so badly about the lost capacity, and I'd get a great round to boot.