In 04 there was a Crossfire.
In 05 they called the original a Limited and added a Base model which has items deleted, only offered in Black, no silver trim around windshield and black side strakes, no fog lights, black door sills, cloth manual seats, no cupholder only a storage bin, lesser sound system, black engine cover instead of grey, rubber pedal covers, 05's had no TPMS,
Also added the SRT, which is supercharged with 100 more horsepower, only offered with an automatic, a fixed larger wing, a 200 mph speedometer and Alcantra seats, and different wheels.
05 was also the first year the roadster was introduced.
There was also a Special Edition which was basically a base roadster painted red with SRT like wheels.
All beautiful cars in there own right IMHO
That is a crash course, there are more differences but that should give you a general idea.
Enjoy your crossfire I know I still do enjoy mine after almost 6 yrs, and the good people you will meet thru this forum and GTG's is an added bonus