High res screen question

Hello,
Today been to the Mac shop, wanted to compare the 15" Macbook retina with the classic one AND the High Res one.
The only **** was they didn't had the High Res on display.
So, i ended up watching an beautiful Retina screen and next to it the 'classic' MAcbook...
But, because i still am not convinced to get the Retina, I will go for the Classic Macbook Pro...

Now here is my question;
On the Retina screen you can choose what setting you want to use the screen. So you could choose between 1440*900, 1680*1050,1920*1200 and 2880*1800.

Can I also do this with the High Res Screen? The high res screen is 1680*1050.
If i buy it and after a week i just can not work with the High Res Screen, can i than put it back to 1440*900 and keep on working with that resolution?

I would love to see an high res first before i buy it, that is nog possible because no shop has them on display. So if i order an high res screen and i can not work with it i still got an useable 'normal' screen.. (and spent 100$ too much)

And, is the high res glossy the same shiny as an 'normal' 1440*900 macbook?

Thanks for any input...