The phrase "thousands of choices" is correct and usable in written English.
You could use it to emphasize the vast range of options that one has. For example: With thousands of choices available, it can be difficult to decide what to buy.
Consumers have thousands of choices in today's markets – why not choose green?
Consumers looking to buy a bottle of wine confront thousands of choices.
Today we have tens of thousands of choices, but we don't have the thinking tools to match.
More than any other game before it, from their abilities to their equipment, your characters in Persona 5 soon come to embody the thousands of choices that you have made leading up to any given moment.
The memoirist is faced with thousands of choices in the course of composing.
Now Apple and Android users can add games, entertainment and any number of productivity tools from a bazaar filled with tens of thousands of choices.
But for the untrained eye, picking out a good white out of hundreds of choices is a tough-enough task.
If browsing the Apple App Store for a fitness app and going through the hundreds of choices is enough to make your brain explode, check out this study from the University of Florida.
A high-enough carbon price would shape millions of choices, small and large, about what to buy, how to invest and how to live that would result in substantial emissions cuts.
There are dozens of timeframes between now and next year and strike prices so there are hundreds of choices to choose from on Apple Puts.
China has 3,000 TV channels, but most of them are operated and distributed locally, so a typical viewer in any one city doesn't have hundreds of choices.
