If you are in TX, you'll be OK with coilovers. Might not find them quite as comfortable in other places in the US.
I have PSS and lived in Killeen with them for a year. They felt great. Now I am in Korea and I get a back punishing ride on the horrible korean roads.
With that said, I'm inclined to recommend Bilstein sports and some nice lowering springs (I like UUCs which drop the car just right).
2013 F30 328i - Melbourne Red
2011 E90 M3 - Monte Carlo Blue
2004 E46 M3 - Imola red