Calrose is perfectly fine if you are looking for japanese grown rice replacement in the US. Same 'Oryza sativa subsp. japonica', just a different cultivar. It's the closest thing to Koshihikari but cheaper and widely available. Actually I'd say it's the best overall rice you can get not grown in Japan.
Good side by side https://upload.wikimedia.org/wikipedia/commons/2/2a/Koshihik...
The "problem" is that you won't find rice like Yumepirika, Akitakomachi, Tsuyahime, or Nanatsuboshi (just a few example of my favorites) anywhere outside of Japan. Even Italy has japonica rice fields but it's a different class all together.
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