Well, as @Cyberian told , you can have a rough idea about your CCC.com domain names.
KG5.com would have a slight higher value than $450, i'd say you can reach a mid-high $xxx range.
Can't really say how much XWMX.com would worth, because it has two different values if the buyer would be chinese or from the rest of the world. Recently the chinese market went crazy for LLLL.com like this one so you can also reach what @biggie says, but it's easier you stop at mid $xxx range in China, or mid-high $xx in the rest of the World.