Do it! There was a 1GGTE in a hilux at the last dyno day I went to running factory turbo's and factory ECU and it made 180rwkw (been like that for well over a year too), that would be fun in an old school celica!
I also know of a couple running single turbo and getting around the 200rwkw mark.
An easy swap if you already have a 1g in there. With potentially a hell of a lot more grunt/fun