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I have an old QHY5 colour as well as a QHY5 mono. Strongly suggest that you get a mono chip - lots more stars for guiding. The 1.3mp field of the standard QHY5 is useful for finding something to guide on and it makes a fairly widefield lunar/solar camera. Don't know anything about the other versions of the QHY5.
its fairly easy to mod a finderscope to add a QHY5 and the result works surprisingly well. The QHY5 just plugs into the mount if you use the on-board ST4 connection - really simple and works fine with phd. If you do not enjoy modifying/making equipment though, get the Orion package or similar.
be wary for planetary - apparently some guide cams have an inbuilt offset for noise control and only allow you to see stars that stand out well above the background - these would not work too well as planetary cams. Both of my QHY5s give the full dynamic range and can do planetary imaging, but you really would be much better off with a dedicated high sensitivity camera for that task.
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