This can be done using the StrReplace function inside your XML package.
Find this line in your XML package:
Code:
<xsl:value-of select="aspdnsf:GetVariantPrice(VariantID, number(HidePriceUntilCart), Price, SalePrice, ExtendedPrice, Points, $pSalesPromptName, TaxClassID)" disable-output-escaping="yes" />
Replace it with this:
Code:
<xsl:value-of select="aspdnsf:StrReplace(aspdnsf:GetVariantPrice(VariantID, number(HidePriceUntilCart), Price, SalePrice, ExtendedPrice, Points, $pSalesPromptName, TaxClassID), 'Price:', '')" disable-output-escaping="yes" />
That will replace "Price: $X.XX" with "$X.XX"