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Of the three choices you give, I'd go with the Eon or Megrez 90. There is a Megrez 90 for sale right now in the classified section for a good price.
The Eon looks like they have upgraded the focuser from the stock ED80 to be on par with the Megrez. Even though it is smaller aperture, the lower f/ratio means that you will get about the same illumination on nebula, etc; they will just be 80% of the size in the Eon.
I've mounted an ED80 on top of an LX200 before, and I know that it is really pushing it for the fork mount, but it can be done. You need good balancing to do it without over-driving the motors, and should reduce the maximum slew speed to be safe. Weight wise, the lightest is the Meade, followed by the Eon, followed by the Megrez. There is only a half kilo spread between them, but it might make or break it for you.
On the plus side, refractors have good resale value, so even if it does not work out for you, you likely will not be out much.
To give you an idea of scale and what you will need for counterweights, I have attached some old shots of the 10" LX200 with an ED80 on top.
Regards,
Eric
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