Wait till you get a yellow sticker, then fill out the mods paperwork.
As for the HID's (xenons), you need to pop out one of the globes currently in the car so you can confirm the globe type (H1, H4, H7 etc). I just got a set of H1 6000k HID kits for $70 off a forum member (Jembo I think it was).
As far as good coilover brand, I run jap spec Cuscos in my 32, stiff as fk. In the wagon I have a set of Teins.
Go talk to Matt or Brad at WA Suspension and they will point you in the right direction