Just jumping in on this thread as I am looking to change my trusty Epson TW9300 too and was initially interested in the Sony XW5000, but without a powered lens and memory (for aspect switching with my scope screen) I was looking at a nearly new VPL-VW790es for a similar price. However, I'm now thinking one of my options could be a XW5000 with a used Lumagen Radiance Pro. The Lumagen could do my aspect switching and squeeze some extra PQ out of the PJ. But don't know whether to go for the Lumagen first and see what difference it make to the Epson in the interim. My budget certainly won't run to a WX6000.
A dillemma indeed.... keep us posted on the Sony, it'll be interesting to see how you get on and how it compares to the Epson.