Love the
Silver Service suggestion (13 number or book online). Pickups at SYD are best done from the departures level, where kerbside kommandants give you 120 seconds before the panzer tank comes in. Waiting area? None other than
Krispy Kreme karpark - just don't eat the doughnuts.
The main problem with taxis anywhere is evening arrivals.
Airport Link is OK, but you're dealing with the shttyrail network. A single to the city is $11, a weekly $34.50... robbery even compared with Brisbane.