In that stock picture, the rear tires (studded winter tires) are 205/55(i think)/r14 and are a tad smaller than my normal 225/60/r14. but you can see the stock tires are fine.

In the front:
2in drop: cut stock coils (not ideal)
2in drop: lowering coils (ideal)
3in drop: lowering coils slightly cut (not bad at all)
3in drop: dream beams on stock coils
5in drop: dream beams + drop coils (perfect)
6+ drop: breams + cut lowering coils (not ideal when cutting a lot)

A camber kit will be required for almost all of the lowering in the front.