This one, no doubt (this is what I have in mind for mine too, together with the lower front grille paint job!). But if the driving experience matters more than the look of the car, go for the coilovers first and throw a rear sway bar in at the same time.
I would not change the upper front grille for a Golf or an 'R' model as I like to keep the same honeycomb look for both grilles. You could get rid of the red lines (or replace/paint/wrap them in black and go for chrome+black GTI/VW emblems from RB Styling) and paint your front lip spoiler in black. Just a thought/something I have on order...
Nice plan! Keep us posted