I've imported lots of Japanese gear over the years. Unfortunately, all of the 100V-only gear I've purchased has given up in 1-2 years tops. If you want to do this, you need to buy a large transformer, and those aren't always reliable anyway (I had a Chinese-made one from Amazon go up in smoke on me once). This is serious, you could burn your house down and kill yourself and everyone who lives with you.
I don't know if the US version has a ground-plug, but the Japanese version definitely does not because they use 2-prong connectors only, with maybe a separate ground lead that you have to manually affix somewhere.
The other issue is you are buying grey-market without warranty.
If you really want the silver, you could buy both and then just swap the chassis. Or better yet, buy another amp that's silver, like a Rotel A12. Honestly, that Denon looks like cheap junk anyway.
