How about “most unique”? “A myriad of”?
As to your question regarding on or two spaces after a period. I am pretty sure that I learned in my high school typing class in the 1960s to make two spaces after a period, after a colon and after a semicolon.
As a matter of fact, I usually still do that — I just did it above! — but Microsoft Word usually flags it as an error.
The double space was common practice with fixed fonts, as in typewritten. Proportional fonts insert a space-and-a-half automatically. That is why Word flags the double space as an error.