Well, if you're putting a turbo on a 2.4L motor, size the turbo to that displacement. All of your turbo theories are very undersized. I would recommend a Mitsu 16G at least. Realistically with that amount of displacement spooling the turbo, you could easily run a Garrett GT30 series turbo and have a very driveable car. If you're looking for boost at 1500rpm, go with a 16G, if you're willing to wait a little longer for spool (many boosted cars don't spool until 2000-3000rpm) then go with a bigger turbo. I could probably give more recommendations, but I don't know exactly what you're looking for.
And yeah, I was looking at putting the Audi turbo on my 1.2L Honda but decided the turbo was too small...