Save the money or the miles on the flight.

I am sure a better hotel room makes the stay more exciting and relaxing than a business class flight.

Of course, I prefer a First Class flight above a economy flight, but at the end it's just a flight for 8 hours. However you will spend a few days at the hotel and whats better than a big bathtub or shower for a couple? Splurge your money/points for the hotel.