A few notes...
The Sharpstar 100Q - rebranded by TS and Stellarvue amongst others - is NOT very sharp. I contemplated it for a while, but it is quite soft, and noticeable blue halation. I have spoken at length to the Sharpstar guys, and they cannot and will not guarantee a good one, and I have read MANY reports - including by the Hong Kong dealer of them - about dirty optics etc. The standard focuser on them is iffy - that is why SV replaces them with FT and jacks the price WAY up accordingly.
The Vixen VSD100 also is not as sharp as Tak, and shows again halation. I had the older Pentax version, and I can NOT recommend it, especially for modern CCD's. Seems fine for film, not so much digital.
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