Completely agree, but the OP seems to want to get by without having to install anything other than the turbo. I would not concider that an option if I was doing it, but he seems intimdated by installing anything else. It will also leave you with a wideband for future use and not just paying for a one time service.

Also. If you don't want to adjust your own timing, you may want to rethink installing a turbo.