Phil,
I don't own an LX90 but be very wary of using 2" accessories with it. The scope only has a 1.25" visual back, which also means it has a smaller hole in the mirror consequently a lot of 2" accessories may vignette with it, particularly longer focal length eyepieces, like 2" 40mm ones, so I suggest you test this out before you shell out your bucks.
The Williams Optics diagonal which Daniel Beringer also sells is excellent but its not cheap, but then good quality products never are, maybe around $200. Its as good as those produced by some other companies like Takahashi and Astro Physics but it costs a lot less. Your wasting your time with anything cheaper than this IMO.
CS-John B
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