As above. No need to change the balancer, battery or clutch unless you have issues with those items. My cam covers were leaking so I got the seals so i could change them all at once. If your changing your plugs with platinum ones and have leaking cam covers change the seals now. it will save you time pulling it all apart to do the seals. I also changed every fluid. Clutch, Gbox, Diff, Coolant, P steer and brake fluids. You never know when it was changed last otherwise.
I bought all my gear at once from Kudos and he gave me a few free upgrades and threw in a few goodies. Message him and let him know what you want. i changed my mind and ordered a heap more and Andrew sent me the goods and let me pay him a week or so later. Not many people would do this. Top bloke. Would recomend anybody at least gets a price from him.
I got the whole Nissan Timing Belt kit and Nissan water pump with nissan seals, Timing belt stud kit, Cam cover gasket set, Ancillary drive belt set, NGK plugs and he threw in a Greddy oil filter. The stud kit is a good idea as theer are stories of them snapping if reused.