As far as mirrorless DSLR's I think the new pellicle mirror Sonay A55 sounds way better than an EVF camera- an optical finder but without the mirror blackout or vibrations.
The Sony setup sounds like a good idea in theory but I would think that it would have to reduce the amount of light available to both the sensor and the viewfinder since it is 'splitting' the available light?
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Peter.
"I spent 90% of my money on women, drink and fast cars. The rest I wasted." - George Best