In my opinion, unless you can sell the DFR for a suitable price and recover some of the cost, I don't think its worth paying the full amount of the DFR again plus $100 more for the upgrade.So is the cobalt worth the $300 extra if you own the red? If not what is a good dfr upgrade
If you are starting from scratch with a $100 dollar difference between the two, I would pay the difference and go for the DFC.