The phrase "a plurality of important" is not correct in standard written English.
It seems to be an incomplete thought and lacks clarity, as "important" typically needs a noun to modify.
Example: "The study revealed a plurality of important factors influencing the outcome."
Alternatives: "a variety of significant" or "multiple key".
Ofcom believes a plurality of media sources is important for a well-functioning democratic society through "informed citizens and preventing too much influence over the political process".
Having abandoned the old nationalist ideal of a state owned by a single dominant ethno-cultural group, liberal nationalists have become receptive to the idea that identification with a plurality of cultures and communities is important for a person's social identity.
A plurality of voters said it is very important to them that Congress pass legislation next year to address the minimum wage.
A plurality of parents said teacher quality was the most important thing to look at when choosing a school.
"The Independent has an important role in providing a plurality of news content in the UK's national newspaper market.
Just as exit polls showed in each previous contest this year, a plurality of voters in Florida said that the most important candidate quality was the ability to beat President Obama (nearly half of all responses).
This year, with Republicans eager to turn Mr. Obama out of the White House, a plurality of voters said it was their single most important consideration; about half supported Mr. Romney.
A plurality of voters, emerging from poll booths, said that the most important issue in the campaign had been "moral values".
Normative pluralism is less radical it posits a plurality of bearers of value.
When given a choice, a plurality of voters -- about a fourth -- rated honesty a more important consideration than experience or an understanding of the complex issues of the day, according to the voter polls.
