shouldnt stiffen the ride up too much. i think pumas need lowered more at the back tho as the rear sits a bit high for my liking. personally i would drop the front 40mm and the rear 60mm but thats just me, the ride would be a little stiffer in the back but it would look much nicer.

at the end of the day its up to you, any 35-60mm springs and shocks will do as theyre all around the same spring rate so there wont be that much of a difference between manufacturers.