I have a rather different experience with my NA and t.b. change.. and was after similar help a while back so i thought i'd share my 2 cents.
I called sydney city toyota (where car is normally serviced) - they quoted me 1.1k over the phone, so a month later i try to make a booking, they said they would have to get back to me regarding a 'proper' quote, hear back from them that afternoon, quoted me in excess of $2000, so that was a definite no.
paul brell quoted me 1.6k roughly
rev doctor quoted me around 1.5 or something liek that - but they didnt have the time to do it at that stage..
ended up going to a place near my home recommended by Dylan, paid around the 1.5k mark, felt great afterwards.
I think these woudl be more realistic figures for you to be looking at (of course other parts would also have to be changed, ie. water pump as just_ace mentioned)