Are monetary values plural? [duplicate]

Possible Duplicate:
Are units in English singular or plural?

I want to say:

Those sixty dollars are gone

That sixty dollars is gone

The reason I ask is because I was originally typing:

Those $60 are gone

But that looks funny to me. Which is more correct?

Plural if you're thinking of the $60 as 60 individual dollars, singular if you're thinking of the sum of money as a whole.

Those sixty dollars are gone

That sixty dollars is gone

I believe that both those and that work when the amount is spelled out, but just as you've written them as PeterShor and Barrie have said with plural and singular verb agreement.

Those sixty dollars were supposed to be my ticket out of this town, and now they're sailing away on a strong southern breeze.

That sixty dollars was supposed to be my ticket out of this town, and now it's sailing away on a strong southern breeze.

Those $60 are gone

When the amount is presented as currency, I believe that is the better choice.