2002 if you want to keep with all PPG. You will be well pleased. Or, if you don't mind using a different brand of clear, SPI universal is hard to beat. Actually it's on par with 2002. 2002 handles just like the concept single stage, and works very well. Uses the same hardener and reducer in the same quantities.
So, you can use DB, or DBC with the same reducer as in DCC, and then use the same catalyst in the 2002 as in the concept color. I prefer dcx61, and reducer to meet conditions. you can "cocktail" reducer to meet specific conditions such as part 870, and part 885, or whatever meets your needs.
It will sand and buff nicely next day. And stay that way.