A 4L60e (or 4L80e) would probably cost the most because it sounds like you'd need the computer to run it.
I would suggest 4L80E using a controller, but buying a used one and installing a shift kit or having it rebuilt. This is by far stronger than the other options, and you don't need a stage x rebuilt one, a basic rebuild and shift kit will handle your car without breaking a sweat and end up being a lot cheaper.
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