Just doesn't seem worth it, IMHO. In order to make it work, I figure you'll need the turbo, air to water intercooler, associated piping for the air, long water hoses for the intercooler, an upgraded waterpump, and probably some other assorted upgrades (like the fuel system). It adds a lot of extra water piping throughout the car, it heats up the engine compartment even more, it's difficult to fit, and it will likely have some lag as it spools up. Oh, and a retuned ECU. For all the money you spend, you'd be better off with just a simple engine swap.
Personally, I'm going to focus on naturally aspirated performance. If/when I get to the point where I need more than I can get from the Toyota lump, I'm going to swap to a better motor. It's already been done before, it's a proven remedy. But no turbo. Not for me.
Cade