Thanks for this - you've introduced me to some promising artists. Interesting that there's no rap, whish is why I gave it a listen. I might do a similar list, although the choice is huge...
My thoughts on your list are mostly very positive...
M83
Very pop for dance music - guitar riff made me think of Abba's Knowing Me, Knowing You.

C2C
That burst of blues gave me the in to the music - some stunning scratching as well. The next track on the album was a bit generic.

Tame Impala
Heard of them :)
They don't get to me quite as much as Yeasayer or Cold War Kids

Vampire Weekend
Agree with your summation. Great track - the bass part screams the 70's Hamlet cigar advert tune (for those of us who were watching ITV back then).

Weyes Blood
Holy cow! This is great. Proper pop anthem material.
Have you encountered Eleanor Friedberger? Check out 'Personal Record'

Half Waif
I love the album cover, but I can't handle that out-of-phase handclap sample on headphones. Stopped after 30".

Deerhunter
Just started to appreciate these guys in the last few months. Good song pick.

Destroyer
Hmm, not doing it for me. At least the whale is happy.

Daft Punk
The only track on this list I knew before playing it. Never done it for me.

Arcade Fire
I should like this band, but I've never found an 'in'. I'll give 'em another go, 'cos I like that distant horn sound.