My solution is to stick a HD5830 or similar card in an old pc (3-4 years old) with no harddrive, maybe 1gb ram (whatever it has), upgrade the power supply, and run the system off linux on a USB stick....about as cheap as it can get for me....
...until the bitcoin return and heat become unbearable....

You never know, some genius might be able to double or triple the throughput on these GPU's....then it's game on again...