-the shins
-iron and wine
-mogwai
-jason mraz
-sigur ros
-antony and the johnsons
-kings of convenience
-clap your hands say yeah
-neutral milk hotel
-the decemberists
You've done well, so far. I, personally, don't even know how to be sick of the Shins, Mogwai, Sigur Ros, or Iron and Wine, though.
Acousticy goodness:
-Sara Lov - Choice songs: "Animals", and "New York". Her band, Devics, is fantastic, too. She's also a total babe, if that counts for anything.
-Sea Wolf - Basically, the whole "Get To The River Before It Runs Too Low" EP.
-Devendra Banhart - Listen around, there will be something you like, I guarantee it.
-Bright Eyes - Again, listen around. Also, not quite acoustic, but a lot of mellow stuff.
-Belle and Sebastian - Everything. Yeah.
Shoegazy Space-rock:
-Silversun Pickups - EVERYTHING. Well, "Lazy Eye", "Kissing Families", "Well Thought Out Twinkles" are starters.
-The Secret Machines - "Now Here Is Nowhere", "Lightning Blue Eyes", "Alone, Jealous, and Stoned". Holy fuck, these guys are amazing.
-Panda Riot. Eety beety band at the moment. Choice songs, uh, hrm, their MySpace stuff plus a song called "Marker"
Unclassified Amazing:
-The Arcade Fire - Funeral. Yes, the entire album.
-TV On The Radio - Start at Young Liars - EP and work your way up.
-Eulogies - "Life Boat", "One Man", "If I Knew You". Adding them on MySpace got me a "Hellooooo" comment from them, which is cool.
Good luck.