For sure, the miles alone are worth at least $1000, and you should be able to find a one way in those classes for a lot less. Use ITA Matrix to search. Dan has a main site post on using it. You can restrict it to delta and those specific fare classes.
Here's an example, though with enough patience, you might find something even less than $250:
Fare 1: Carrier DL XA14ETSA NYC to ATL (rules)
Passenger type ADT, one-way fare, booking code Z
Covers JFK-ATL (Business)
$218.61
US Transportation Tax (US) $16.40
US September 11th Security Fee (AY) $2.50
US Passenger Facility Charge (XF) $4.50
US Flight Segment Tax (ZP) $4.00
Subtotal per passenger $246.01
Number of passengers x1
TOTAL AIRFARE & TAXES $246.01