Welcome to the club! I am a recent member as well after choosing an SRT coupe over a Limited Roadster, a 350Z Roadster, and a few others.
Both engines and trannys in the Crossfire seems solid. Get an SRT if you want something stupid fast that can hang with a Vette or 911, get a Limited Roadster if you want a touring looker with a sports car soul. Even the non-SRT engine will let you have fun. It feels a whole lot more powerful than the numbers indicate. Its little sluggish off the line, but once you're moving you are rarely wanting for power.
From what I've read on reliability, there aren't that many serious issues. The things that do go wrong tend to be minor. When looking to buy one be sure to check under the rubber trim at the base of the doors and the rear hatch for rust. Some people have had issues with this, others have not.
Be prepard to receive a lot of attention when driving a Crossfire. In the couple weeks I've had mine I literally haven't stopped once where there were people around that I wasn't asked at least one question about it, usually to the tune of; "what is that?", "is that fast?", "can you get these at a dealership?", "can I sleep with you now?". OK, so I threw that last one in there, but I'm keeping my fingers crossed