add on features in safari 3

i have safari 3 with safari stand running smoothly. i want to make the switch from firefox to safari but there are a few features holding me back. the first is auto word complete. this sves me loads of time and i want to get somthing like this in safari, and also i want to be able to make the search bar search google .ca not .com

what add-ons or plugins do i need to make this happen

if there's any other cool things that make safari even better let me know too