You should be fine with a 2012, if you're worried about the "new" engine. Honestly, these engines are getting so good that they hardly ever mess up... maybe like 1 in 100,000 (totally made up statistic).
JUST BE SURE TO NOT TUNE YOUR ENGINE, or you will be on your own. There have been a few "my engine blew up" threads, but if you read, it always says that the engine had a tune.
So as long as you don't tune your engine, you will be fine.
For a good read on the new engine, here's a thread
http://www.camaro5.com/forums/showthread.php?t=147561