I'd got i5 + 470. The 470 is amazing at overclocking and hits 480 territory, and doing so on needed quad core CPU. Also, the prices of i3 are funny nowadays and only are inflated since AMD hasn't released their new CPUs yet. (on knees praying)
Lots of great 470s, get that and i5 and you can upgrade the GPU in 2 years. Keep in mind, the GPU is upgraded more often than CPU.