So I WAS going to get a second 7850, but I have been reading leaked specs for the upcoming 8850 and 8870, and I might as well go with two 8850's because they are going to have about 70% faster computing power (G/Flops, T/Flops etc) and ~20% performance increases in all other specs for the same price as the 7850 is currently. Hopefully the GPU's use the same size PCB, I like how small the 7850 is.
This isn't really on-topic. If you want to chat, feel free to hit up the chat forum! - noteworthynerd