Besides the omg price, 17" is not for me as I value the smaller ones for potability more, but I need more power than the 13", as it's going to be my only pc. Plus i have the ipad 2, so 13" is like the same kinda size, 15" gives me more choices of size vs portability. 15" Matte is tempting, but I kinna dig the glossy too. It's the browns VS reds of the Mac world, ya know?
And since I'll be typing on my Filco in closed lid mode on my 23" ips LCD, a 17" will just get in the way.