You forgot one of the biggest oil manufactures on the planet... GULF
I've been using GULF Formula G, which is a fully synthetic oil and it is actually pretty cheap.. about $30 for the 4 litres. It really is one of the best bang for your buck fully synthetic oil. They have the spec ratings for BMW, Audi and VW Cars. For those wanting the best protection available, the Gulf Competition brand is... by far the best out there, but its for extreme use, such as racing.
If you're looking for a high performance / racing grade oil for a great price, RedLine is pretty amazing for the price. I've been using their gear oils for 4 years now and love it.
One thing to note about some other big name companies like Castrol, Shell, Mobil and Penzoil, is that the normal every-day grades that you find in Canada are not all fully synthetic. I think there are only a few grades such as 0w30 and 15w50 that are fully synthetic, the rest are labeled that, but at best are just a blend.