I think the JRZ dampers are intriguing.
I really like the TC Kline smart design coilovers for my E46...once you get the rebound and compression settings set right, its a comfy ride and handles great! On full soft with 600/700lb springs, it was pretty bouncy. Not ricer honda bouncy but I hit my head against the headliner twice going over some bumps.
Those two options are something to consider. Or you can fall for the marketing and follow the crowd to KW.
2015 F34 328iX GT Glacier Silver
2011 E90 M3 Monte Carlo Blue
2004 E46 M3 Imola Red