I bought my LS1 w/ T56 complete (ecm, wiring, accesories, etc.) w/ 12k miles for $5,000. I also have a rear differential out of a cts-v as a backup in case the solstice one gives out. I paid $500 for that with 500 miles on it.

jag, what all did you include in the $13,000 estimate?

-Adam