Ok....so small bolt pattern vs big bolt pattern infos !

I know wilwood offers a front disk brake kit that has dual bolt pattern (5x4" and 5x4.5") that should bolt on to your existing hubs... not cheap but might be easiest option on the market. Good thing is that if one day you decide to change your BP for better rim selection, it's as easy as moving the studs.
I have personally tried up upgrade everything with "factory" parts (aka parts that I can easily find at any parts store) because I don't have much trust in the aftermarket. I don't want to feel stuck if one day they decide that their stuff is outdated and they discontinue everything and now I'm left having to re-do my entire brake system again.
IMO, your best bet is to decide your power/performance goals for the car and give Dr.Diff a call to figure out an appropriate system for you.