Here we go again !
I think before you decide on what brakes you need, you have to look at your driving habits and what kind of life your GL will lead.
For a daily driver that doesn't see any track/autocross use, the single pots would be more than enough (even for autocrosses)
If you are going to be track racing your daily driver every weekend, then the 4 pots would suit you.
My .02
Sandeep