If you want to watch some high level Starcraft 2 matches with expert commentary, might I suggest this year's Starcraft 2 Dreamhack tournament, which took place last month on the 25th, 26th, and 27th. It was a large tournament with a huge prize pool. You can read more about it here. Day9 was shout-casting along with d.Apollo. If you have the time, I suggest watching the entire tournament start to finish. There is a lot of good gameplay with more than a few surprises.

The tournament is available here on Day9's blip.tv archive. You will have to scroll back a few pages to get to the beginning of the tournament.