The big screen has the same number of characters as the smaller one, it's just bigger. It therefore shows the same number of parameters to be displayed.
The bigger LCD if you're interested would cost an extra $100, this would cover the screen and front panel. Everything else is the same.
Different LCDs (like the ones the S-AFC uses) are an extra $120 on their own from memory, this is from the manufacturer (whose name escapes me atm).
Impakt