I was looking for a hosted wiki solution initially for personal use.

I used the wikimatrix +choicewizard (thank you to CosmoCode, whoever you are)
and ended up trying out a lot of the services.

A relatively detailed uptodate personal impression about each one
is posted on the individual sites and also a pointerlist on general list.

The overall conclusion is that I am not impressed.
The number of wikis is absolutely overwhelming, yet the features I would need are badly lacking.

My ideal wishlist of a CMS

* import:
a facility which includes a file into wiki or imports it as a new page
inline (restricted to certain formats, notably text, html, etc.)
or attached, both with later editability

* export (pdf, html, xml)
and most importantly batch export of the whole wiki/place/site as an archive
in a format which can be reimported after offsite edits

* tag system (not html keywords, not one word stuff), a fully fledged
categorization support with tag search, index generation with a tag,
subscribing to a tag, strict search for tag conjunctions (give me male AND actor)
etc. the way most social bookmarking sites has had it for a while.

* file (attachment) management

* conflict (ambiguity) resolution

* cross-platform and cross-browser operability.
This is especially striking cause most wikis advertise the idea
that whereever you are (for me: whatever OS, browser), you can access your notes/site.
So one would expect a cms to be at least moderately browser-independent, offering the same
features/behaviour irrespective of browser/OS

* backlinks, history with diff, index generation, automatic (default) navigation,
customizable themes.
Video, image, table etc embeds, arbitrary html tags are available in all serious wikis, so not worth mentioning.

* no ads on site (at least possibility for ad-free view for a visitor)

* anonymous user comments

* subscription to site, user, category, tag, page

Most of these are commonplace technology and/or some do exist indivudually in
various wikis or other bookmarking or blogging sites.

Does anyone have any suggestion for a CMS that at least approximates these features?

Any suggestions for what I should use?
If you know a system that does this, but is not hosted, please let me know too.

Thank you