I found a refurbished, rev B 1.8GHz with 128GB SSD. The price is $1449, compare to the new 2.13GHz that is $1699 (with student discount). The only difference between the two are the CPU speed and that the rev B doesn't comes with the Ethernet adapter. I am not a graphic designer, and the most CPU intensive things I do are probably watching .x264 720p HD MP4 videos, and maybe occasionally play games like Tiberium War. Including tax and everything, the 2.13Ghz is $270 more expensive than the refurbished 1.86Ghz, my question is, does the extra 0.27GHz worth the extra money? Thanks a lot!