è solo un'idea...

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Note added at 22 mins (2007-08-21 14:01:29 GMT)
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Nouveau riche
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For bands under the name "Nouveau Riche", see Nouveau Riche (band).

Nouveau riche (French for "new rich"), or new money refers to persons who acquire wealth within their generation. It is generally used to emphasize that the persons were previously part of a lower economic or social class, and that the acquisition of wealth has provided the ability to do or to have things that were previously out of their reach.

The term can also be used in a derogatory fashion, for the purposes of social class distinction, to describe persons with newfound wealth and who are viewed as lacking the experience, finesse, or taste to use wealth in the same manner as old money - persons from families who have been wealthy for multiple generations. The implication is that, despite their wealth, they are still of lower- or middle-class origin, and therefore culturally inferior. A stereotypical example would be persons with new wealth who spend money conspicuously, or who show preferences for things normally associated with people from lower economic classes.

maybe

If the suffix 'astro' refers to extreme wealth (namely to stinking rich as Ivana points out) then this is my take. If it refers to newly enriched individuals then 'nouveau rich' would be of preference.

Un'alternativa

über is commonly used nowadays and I think it has the slightly derogatory connation you are looking for.

the rich, and the flash, is another possibility.

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Note added at 1 hr (2007-08-21 15:06:35 GMT)
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Or

the haves and the have-mores.

Hi Umberto
I wouldn't stray too far from the ST - I think "the rich" has the negative overtones you need

I found this rather amusing:
http://www.jpmartin.com/investment/being-rich-vs-being-wealt...

From:
http://www.phrases.org.uk/meanings/filthy-rich.html
Meaning

Very rich, possibly having become so by unfair means.

Origin

This little phrase can't be explained without looking at the word lucre. From the 14th century lucre has meant money and is referred to as such by no less writers than Chaucer and John Wyclif. These references generally included a negative connotation and gave rise to the terms "foul lucre" and "filthy lucre", which have been in use since the 16th century. "Filthy lucre" appears first in print in 1526 in the works of William Tindale:

"Teachinge thinges which they ought not, because of filthy lucre."

Tindale was here using the term to mean dishonourable gain.