OK so now what....

2 last 2 cards are being shipped back to Amazon due to failing fans. I have either the opportunity to sell the rig and get out of the business of mining or I have to buy new GPU.  I only have a case (HAF-XB) not a large multi-card rig and it seems if I use anything but buying 4 750ti cards I run in the red losing $0.50 per day, not much granted but still a loss.  I could look at either a couple of Sapphire R9 280x Vapor-x TRI-x cards which will run at about 360k/hs with a system 550w ish draw.  Or buy 4 750ti's that I might get 560k/hs out of with a system power draw of 300w ish, but the has rate is less, should I care?  its more efficient, but are the cards useful enough if I stop mining.  my Pc has a 6870 AMD card in it as it is, where as the Vapor-x would definitely be an improvement should I decide to stop mining and keep a card.

I'm almost tempted to give up as there is virtually no profit to be had, or should I go with the 750ti's for efficiency sake or a couple of Vapor-x's as the better hash rate will serve me well if the prices go up