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Going off topic here, but you do realize that an iMac is actually about the same cost as a "PC" built with comparable parts of equal quality? this has been proven many times on this forum.
And with regards to the GTX780 overpriced is again in the eye of the beholder, IMO its on a tier above the 7970/680 so should be priced as such. its not like it isn't common for a card that stands above the rest to cost more as Titan does (The Voodoo 5 6000 was >$800 in today's money, and the MARS I/II? whoa) and the GTX780 stands closer to Titan than the 7970/680.
Indeed ! we may remember that untill revealed the GTX 780 actually was under the name GTX Titan LE ! ... which still makes me wonder why they didn't just call it that since it's so close in performance to Titan ?. It reminds me of the GeForce 3 Ti200, GeForce 3, GeForce 3 Ti500 days