290 trade?

I have 3 R9 290's (not 290x's!). 1 is out for RMA and will be back soon (hopefully). The only place in my house I have to run them with a large enough sized breaker is in the utility room. The reason I'd like to trade the 290's is because they are the reference models and they run too hot for that room. Please let me know what you have to offer. I am interested in 280x's, but not the Gigabyte ones. The 2 290's mine scrypt coins atm and run at 815kh/s at stock settings. 1 of them runs at 750kh/s at stock but can be overclocked to hit 845kh/s. I use GUIMiner and I have been told they can go even higher with CGMiner but never took the time to mess with that seeing as I could never get it to work.

Feel free to leave me a message with your offer. They got for $520-600 on Ebay and Amazon depending on the market. Thanks!