I voted for (and in real life opted for) the 15" MBP. Budget was a concern but overall, I felt the then 2.53 MBP was the best bang for the buck. That model had more L2 cache, vram, 4gig of ram, larger HD for a modest price increase.
I chose the 15" model over the 13" MB because of the superior display panel at the time, and the dual GPU.
I felt that the 17" model was too large and unwieldy. It consumes too much space to use it on an airplane, it eats up desk space and when I have it at home I have the laptop hooked up to an external monitor there by mitigating the biggest feature of the model - the screen size. You're paying a premium just for the large display (and now the matte display option as well).