Mine is a 987.2 S with PDK and PASM, if you're happy with the standard suspension then I don't think it's worth changing just for that. Sport mode is a bit firm for poor road surfaces - there's a nice wee diagram here. PDK is a much bigger change obviously and mostly down to personal preference, mine is my only car too and with the switchable options it's pretty comfortable and practical in urban traffic but quite transformed with the Sport stuff selected . Xenons are pretty good, but I don't know what the standard headlights are like - I believe there is even an LED aftermarket option now though!