Thanks to a loaner unit from Other World Computing, I will have an Apple iMac 27" 3.4 GHz with Fusion drive arriving for testing next week.
My intent is to make a similar performance survey as I did for the Mac Mini, but this time I can test with 8/16/32GB memory also.
Among other things, I will also test the ultra-fast OWC Helios / Accelsior PCIe SSD Thunderbolt setup, especially since there is no easy way to add an internal SSD to the iMac. See the impressive performance boost that the Helios/Accelsior can deliver for the MacMini.
See my recommended Macs page for buying suggestions.
See also New Apple 27" iMac — 32GB Memory.