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How wide do you want to go? As wide as your QX?
I'm working on acquiring a 60 degree 8.5mm Pentax XF. If I do I'll post about it soon after trying it. This EP is not as wide as the QX but should be a much better performer.
The general rule with a scope like yours is spend big bucks on Naglers, Pentaxes and maybe even a coma corrector if you want sharpness edge-to-edge. Recent less expensive alternatives on the market are the Orion Stratus and the very similar Baader Hyperion. These are excetionally good value and have a wide 68 degree FOV. The Stratus work well in my f6 and they are reported to work well at f5 too. But f4, I'm not sure. But given that the QX is working for you, the Stratus or Hyperion should work even better, and are probably the best bang-for-buck EPs for your scope.
But my advice would be to spend some time (couple of months at least) using the EPs you have and learing their strengths and weaknesses. I can understand why you might frown at this though. But if your plossls are really bad, you could upgrade them to better ones without spending much money to begin with.
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