For working on the Crossfire I'd stick with Ultimate Compound on a polishing pad at a fairly high speed on the buffer (5 for sure) and follow with Ultimate Polish on a finishing pad at a reduced speed - 3 to 4 range. Finish off with whatever wax floats your boat. Ultimate Compound and Ultimate Polish each run around $10/bottle at WalMart or most larger auto parts stores, but they are derived from our top of the line pro stuff - just tweaked to make them a bit more user friendly on a DA.

If you look through the "Pictures from Saturday Classes" section of the meguiarsonline.com forum you'll see a huge range of vehicles that we've taken from crap to gorgeous easily with these products. It's what I use when teaching those classes.

Keep in mind that the above is just a good starting point for the vast majority of vehicles. You get out what you put into it, meaning if someone doesn't take the time to learn proper technique with the tool they won't get the kind of results they want. By the same token, you can adjust that technique for different paints (well, honestly, you have to) and you can take additional steps, and devote more time, to get the best finish possible. It's not unusual for me to spend upwards of 10 hours on the paint alone when detailing a car. My own Crossfire, a 2005 model purchased new in the summer of 2007, was mess when I got it. I put almost 20 hours of rotary work into it to get it where I want it. That's a LOT of time for a two seater car with no roof!! But then again, I'm a wee bit over the top with this sort of thing.