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You probably won't see any performance improvement for wireless devices with the Superhub, it may be worse as some users have reported the wireless on it is quite weak.

All wireless N certified equipment should be compatible with each other, including ones for £10 or less off Amazon.

The PS3 won't work with standard N adapters but I don't see the need. Gaming doesn't really use much bandwidth anyway, and G can be more consistent with pings/latency. A wireless bridge will be a cheaper and faster option than homeplugs.

You won't be able to get 30mb if you have an old Ambit modem. You need to get the new Superhub to be able to receive 30mbps service.