+1 for the classy at 420 , out of the rest i'd take the ghz edition
The GHz was the one I was mainly torn towards at the start but there was a lot of love for the classy in this thread.
With a search around the usual Tech shops I can currently pick up the GHz 780 for £379.99 which is £40-£60 cheaper than the classy...

Mine (arrived tues) has Hynix according to GPUZ