BLU Vivo Air
The BLU Vivo Air was announced at CES earlier this year, and is one of the thinnest phones in the world. Coming in at only 5.1mm thin, it has decent specs, and only costs $199 (on sale for $180). Making it instantly one of the top choices on our list. BLU isn't a household name, but they're decent budget phones made in China and sold by a US company.
The Vivo Air has a 4.8-inch 1280 x 720p HD display that looks pretty crisp and bright, an 8-core processor with 1GB of RAM, and has 16GB of internal storage. Our only complaint is there's no micro-SD slot. So think about how much storage you need. This phone sports a decent 8 megapixel rear and 5 megapixel front camera setup, a 2,100 mAh battery, Android 4.4 KitKat with a promise to Android 5.0 Lollipop soon. It comes in three colors: White, Black or Gold. It's slim, sleek, and more importantly, cheap. Being just $180 it's worth considering.