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1) No, best bet to contact the addon authors.

2) No, however I have just finished a similar project (to import into the resources manager, so may be able to help depending on your budget)

3) ExtraPortal

4) No, paypal only at the moment

5) Jake Bunces Nodes as tabs addon

6) Fantastic (especially if using enhanced search)

7) XF SEO is well regarded as some of, if not the best going at the moment.