tiny voices said:
the GPU is relatively weak for the rest of the build. For $1000 get a gtx 670 and a 120gb SSD. The rest looks good.
The 7850 is not a weak GPU at all - better would be to get a GTX 660Ti, 7950, or 7870 GHz edition - A GTX 670 might be out of the question for this budget. Especially if you want a 3570K.