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The 7 and 10 are better than the 14 (the 14 has some field curvature), and I think the 14 is better than the 20 (going by Rob's and John's reports).
The 7 and 10 might be too close together for you though, depends what magnifications you want.
I own the 7mm, and love it. I've looked through John's 10mm and that is equally as good.
Star Optics are one of the only suppliers of Pentax gear in Australia, but have heard nothing but good things about them.
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