Check out Microscope.com website and the Dino-lite AM2111 Basic digital microscope and ask for a deal on the MS35B stand in combo? I paid 200 but you may be able to get for a lot less in combo? This setup is light years ahead of the cheap setups!
Regardless of what microscope camera you end up with, lighting matters a heck of a lot. As others have alluded to the LEDs that come with most small USB microscope cameras may not be the best for illuminating reflective objects like coins. When you receive your new microscope, play around with other light sources. You may find that a single point source of light shining on the coin at a shallow angle works well, or that a diffused light source shining in from all angles works best. Also, different light sources (LEDs, fluorescent lights, incandescent bulbs) will have a huge impact on the color rendering (overall eye appeal) of the images.
I have the celestron one and another brand of that one you showed they are all made by the same factory, just different names and prices I bought both of of Amazon as they have plenty of price points to choice from.
I have a stereo scope, along with a Dino type USB and Celestron hand held digital with screen and card slot. The others are in the post before this one. If any body is looking for a stero or monoscope. I have a friend that deals in lab equipment and scopes Depending on the scope and its condition, they are very reasonable. Ebay-papamed4 or papamed4@aol.com The pic was taken yesterday @ the local gun show. His name is Herschell