I like the new unibody enclosure. The old design had that gasket going around the edge which I didn't like. The new monitor with it being all black looks really nice however the bezel could perhaps be a little thinner.
I like the Keyboard of the old design but I like the overall form of the new design.
If it was me I would have probably created something between the two machines, keeping the latch-less design of the unibody casing with the unibody base but the old style keyboard with a thinner bezel. I would have also offered a Glossy version (With Glass pane) and a non-glossy version without the Glass but keeping the Black bezel.
I currently have a 2006 17" MacBook Pro which I'll be replacing with a new Unibody 17" MacBook Pro and I don't feel any loss by going to the new design although I am feeling a little worried about the Glossy display. I've seen them in person and they don't work very well in office buildings with many overhead light fixtures in the ceiling.
So just get the matte, I think the silver looks ok.