I chose powerline for a specific distant room in my house where no wifi extension solution was ever sufficient. What you pick is going to depend on your local conditions. I have not used the first two, but I have used Wifi vs Powerline so I can comment on that. I'm thinking that option 3 would be the best for me, because the ethernet connection is pretty much guaranteed to work. As the D-Link one supports up to 200Mb/s it should be 'future-proof' if we get faster internet in the future (and who needs those speeds anyway!) so it should be quite fine. There are more expensive versions of the same sort of thing out there, but I don't think that that means they will necessarily work any better.
Powerline/ethernet over power product, which is not too expensive and should work as it connects to the computer through ethernet.
However, it could be difficult to get service and support for this if it doesn't work as it comes from the US, so I'm steering away from it a little. Another USB adapter, recommended by Network 23 earlier in the thread, more expensive but it specifies that it will work with Macs. I should be able to return or replace this if it doesn't work, but does cheaper mean worse quality when it comes to these sorts of things? $19.00. Just a simple USB adapter that is on sale at Officeworks. Does anyone have any experience or tips with any of these? Obviously I just want to make sure I get a good value product that works properly!ฤก. Ok, so I have made a bit of a shortlist of products that I think could work for me.