The Caddy worked great for me last weekend, though I was running the regular touring car class because my friends didn't inform me of the limited gear ratio ahead of time. On a small medium grip parking lot layout it didn't seem to give up anything to the traditional touring car bodies.
Since there was discussion of what bodies we'd like have I'd like to suggest that someone make the latest generation Miata. The Miata is the most raced real car on the planet and it's about time someone made one in 1/9th scale (it's a small car so 1/9th) should be just about right. I am biased as I run a 2004 Mazdaspeed Miata on open track days and will be hitting Laguna Seca early next month.