@ancjob: 'z800 exp. makes me cautious trying any OLED based units.....i guess z800 uses cheap quality OLEDs though emagin makes better OLEDs refer here : http://www.emagin.com/oled-microdisplays/
It sounds like you have both Headplay and Z800? What exactly has been your problem with your Z800? You mentioned you had fuzzy edges or something like that?
I ask, as I have a secondhand, repaired Z800, and it still is crisp, bright, and clear, right to the edges (well, all except the edge that now has some sort of OLED cancer). Basically, its no worse than the 23" CRT thats attached to the same PC. I really don't see how it could be much brighter or clearer without an increase in resolution.
Did you have a problem with the OLED crapping out on yours? Mines developed a black spot cancer on one side that is a little annoying, just wondering if you had a similar issue...
Also, does the headplay support any page flipping modes such as that provided by iZ3D? IE, can you still use Headplay with drivers such as IZ3D and Tridef?