I love mining during winter ... keeps the house cozy and warm

Any suggestions on the best hash capable card currently on newegg.com that is below $500 USD (ideally closer to the $400 mark) and best for khash/$? Too many decisions and options ... can't make my mind up ....
R9 280x. Just picked up a third last week. ~$400 and I get between 680-730 khash/s per card
I spent $450 on the R9 280x (TOXIC- OC) and without a doubt I get 750Kh STABLE nothing less unless the pool goes wacko then the hash drops but thats got nothing to do with the card. I have mined in other pools and constant 750KH all the way, They DO reach 815KH but then it starts to become abit unstable