30mm drop and avoid G-Max shit more than you would dipping male genitals in a piranha tank at feeding time.

If you don't want a harsh ride fitting 17's probably isn't what you want to be doing.

Koni's are pretty much the best there is and beleive me you don't want something that handles like a banana. You could try new standard dampers and a set of lowering springs (again no more than 30mm).