I think if you spend the minimum required, you'll get the bonus with Delta Gold.
If you want a PRG bonus, just cancel your regular Gold card, wait for the appropriate time to lapse, then Apply for PRG.
As of 1/10/2014 EX FICO - 748. EQ FICO - 728. Trans FICO - 755
WellsFargo - $3,000 AMEX BCE - $18,000 Chase Freedom - $4,000