HTC has just announced a new line of 4G smartphones — the ThunderBolt will come out on Verizon, the Evo Shift on Sprint and the Inspire on AT&T.

With these new arrivals, HTC’s portfolio of 4G devices has grown to six total, including the original Evo, the G2 and the MyTouch.

We were lucky enough to grab side-by-side pics of all three devices at CES today.

The Evo Shift, HTC’s newest Sprint device, features a slide-out QWERTY keyboard, a 5MP rear-facing camera and a low $149 price point that’s sure to attract would-be first-time smartphone buyers. The device has a relatively small, 3.6-inch display and no front-facing camera.

The HTC/Verizon ThunderBolt comes with deeply integrated Skype () technology and is part of Verizon’s all-new 4G LTE connectivity plans. This device also features an 8MP camera and a 4.3-inch display.

The Inspire, which HTC is partnering with AT&T to bring to market, features a large, 4.3-inch screen, as well as some new advances in HTC’s Sense technology, including an online component that will allow users to locate lost phones or wipe a phone’s data from a website.

All three devices will ship with Android () 2.2, a.k.a. Froyo; however, release dates for all phones aren’t yet available.

Once upon a time if you wanted to use your phone hands-free you were forced to look like an extra from Star Trek with an unwieldy earpiece hanging from your head. However, there are now some seriously sleek options out there.

Have a look below for our quintet of cool cellphone headsets, and let us know in the comments which ones you wouldn’t be ashamed to be seen wearing out and about.

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1. Plantronics Discovery 975

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Gorgeously minimal, Plantronics’ Discovery 975 is ideal for anyone looking for a particularly elegant solution for wireless cellphone conversations. Striking in its simplicity, the 975 is more than just good looking — its carry case conveniently charges the earpiece, a clever design that means you can juice up on the go.

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2. Motorola Oasis

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Boasting all day comfort, the Oasis is no slouch in the looks department, with a modern black and chrome finish and a tidy, behind-the-ear design. Motorola claims the Oasis is the lightest headset available, but it still manages to pack in voice prompt commands, dual-mics for noise cancellation and the ability to pair with two Bluetooth devices at the same time.

Cost: $79.99

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3. Jawbone Icon

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Jawbone makes hip headsets for the cool kids. The Icon is the company’s flagship model (in Jawbone’s words, “simply the best friggin’ headset on the planet”). It’s available in 10 unique styles, all of which are cool and contemporary. The gadget also comes with seven different earbud options, so it’s safe to say you’ll almost certainly find a combination to suit your taste.

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4. BlueAnt Q2

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With a classic design, the Q2’s simple good looks are backed up by some serious technology. This high-end headset won’t draw unnecessary attention to itself, yet it will offer you comprehensive voice recognition commands and text-to-speech technology that announces the names of incoming callers and reads aloud SMS messages. You can get all of that wonderful Star Trek tech with none of its clunky looks.

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5. Jabra Stone

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Arguably the most dramatic design on this list, Jabra’s Stone headset is about as far removed from your standard wireless Bluetooth accessory as you can get. The Stone boasts cool, curvaceous looks, as well as a portable charging unit that the headset slots neatly into, and it is available in both black and white. If you want to stand out from the crowd, the Stone is a rocking option for you.