The cab'd versions of the 45C and 55C are nite and day, totally different. If I could afford or even justify the DK55C, It would be sitting on 4 acres right now, LOL. Make sure you see one before you buy the DK45C.
I stopped by Midland's in Des Moines on the way to Chicago. They have on the lot a DK35, DK40, DK45 and a DK65C. I was surprised by the size difference from the DK35 to the DK40. The DK65C cab is very nice. They all had loaders.