I have both the 4" and 6" versions, with full shrouds, adjustable sights, and stainless steel (models KGP-141 and KGP-161). A local gun-shop (Houston) has these listed for $369.
Since I use these for target shooting, plinking, pest control, and self-defense, I don't mind the extra weight nor the shinier metal. I like the adjustable sights since I shoot both light target loads and heavy magnums. The extra weight from the full shrouds are nice when shooting magnums, but can be a pain if you plan on packing them much. I think the blued guns look better, but the stainless steel ones are much easier to clean (since they can tolerate harsher cleaners/brushes) and they resist rust better than the blued guns. I also don't have to be as careful about minor scratches or holster-wear with the SS.
I don't use these for concealed carry on my body (I have a SP-101 2.25" 357Mag for that), but I do use the 4" for self-defense at home and in my car. The 6" obviously has a longer sight radius and is heavier, but I find the 4" a great comprimise between the SP-101 and the 6" GP-100 when in confined spaces.
I hope this helps. It's kind of hard to answer your question when you weren't clear on what/how you intend to use the gun.