Thinking about getting convertible and considering a used Crossfire - had a few questions:

What are the different levels/models of Crossfire and what are the significant options in each? Can a base model be optioned out to look like a higher trim model? Are there any performance mechanical performance differences like limited slip rear dif. etc.
For the non-SRT6 model, is there still enough pep with the auto-trans or is stick better?
Do all Crossfires have the rear wing that lifts & lowers? Is this really functional or is it more of a novelty?

Lastly, is it ok to open/close the convertible top multiple times a day or does that promote wear & tear of the fabric top & mechanical. For example if you leave for work in the morning put the top down, then back up when you get to work, then repeat on the way home daily.