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Firstly, check out Crash of Rhinos, they're an emo band who released one hell of a debut this year, they fit the 'new' criteria quite literally.
Also, judging from your list, Squirrel Bait, Bastro, Lungfish, Dag Nasty, Texas is the Reason, Mock Orange, American Football, Mineral, Braid, Jawbox, Shudder to Think, Rites of Spring, Beefeater, Indian Summer, Faraquet, Don Caballero, Saccharine Trust and The Effigies are bands off the top of my head that you may appreciate.
Thanks for all the suggestions.
I've already got Bastro, Lungfish, Dag Nasty, Texas is the Reason, Jawbox, Shudder to Think, Rites of Spring, Beefeater, Faraquet, and Don Cab in my arsenal. Any albums from the other ones that you recommend?