I believe that the Valor line varies from the Classic line in that it has even more attention to detail in the fitting department and comes with slim G10 grips. My cbob is very tight, but there are a couple of slight nitpicky imperfections here and there. There is more dehorning on the vbob as well. I don't believe there are any mim parts in the dan wesson guns, but I'm not sure.
The main price increase is based on the huge success of the first issue valor model. When the valor came out, it could be had for about 1200 new, but was comparable in quality to a springfield TRP, but with more classic lines than the very modern TRP. They sold so fast that I'd guess that they thought that the guns could still sell well at a higher price. CZ then raised the price of all of the DW guns, and changed alot of the linup.