I think I'd want to see Girl Talk the most out of all those acts. His show at LiveCity Yaletown was my favourite show during the Olympics.
For those who don't know who Girl Talk is, he's probably the best mash-up DJ out there. You can download his latest album for free (and legally) here:
http://www.illegal-art.net/allday/
I used to be a big Weezer fan in high-school but now I wish they would just part ways.