correct me if i'm wrong, but first you said you didn't want to upgrade everything and wanted a daily driver, now you are planning on fitting a turbo to a 3S-FE?
my advice is to skip the turbo and concentrate on everythign else which is is chassis related first. replace ALL bushes, grommets etc first, then make sure EVERYTHING under the body is in 100% working order.
only after that will i suggest you go for a power upgrade...