Just a wee update - I went into my local Apple Store today to take a look at the models on display. Of the three on display, two reported they had an LSN screen whereas the other just reported Color LCD which makes me think it's some other manufacturer - perhaps LG or maybe some other company entirely.
I ended up buying another 2.3GHz model in store and this one's screen is pretty much perfect - all screens have some level of uniformity variation but I can't detect any issues on this one with the naked eye. I checked and it's a Samsung display, but it looks significantly better than the 2.3GHz model I got online.
Good screens are out there!
Funny enough i went to the Apple store today too. Checked out display models 5 screens were perfect, 3 were my type of screen.
I'm gonna return this one and reorder. I can't buy in store because of the education discounts i get through my University network.
I simply can't accept my current screen knowing there are better displays out there. Even from the same manufacturer!