It depends if you're giving it to a client and if there's going to be much in the way of CMS functionality.
Looking at that template, I really can't see any need for as many as 10 addons. The only addon I'd say was worthwhile is Freeform, which handles form submissions nicely.
If giving it to a client, the ones I use most often are:
- [CE Image] for image manipulation.
- [SEO Lite] which just adds a meta title/description/keywords field (though this is not necessary and could be done through regular fields and a little logic).
- [Structure] which gives a nice UI to your pages which makes it much easier for a client to use and also helps with generating menus, sitemaps etc. (although again, this could be achieved with the standard EE [Pages] module but Structure is far easier for clients to understand in my opinion).
- [WYGWAM] which is just a rich text editor (again, not necessary as the standard EE one would be fine but WYGWAM is nicer to use).
These are mostly professionally maintained and updated regularly.