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I also checked out Sony’s Vaio Y, which has a 13.3-inch screen and runs a CULV version of Intel’s Core i3. It’s slim and available in an array of colors for $770. Some earlier CULV chips struggled with playback of Flash-based video, but that’s not an issue with a Core i3.

The Vaio Y weighs 3.9 pounds. But, surprise, surprise, similarly light laptops can now be had with full-power, non-CULV chips. Hewlett-Packard’s dm4t has a bigger screen than the Vaio Y, a Core i5 chip and a DVD drive; it weighs just half a pound more, though it is considerably thicker. It starts at $700. One upgrade worth mentioning here is that you can get a separate graphics card for $100, if the PC will be used for gaming.

One note of caution: both the Vaio Y and dm4t have metal-clad covers. They look spiffy and expensive, but aluminum is, in my experience, more prone to scuffs, scratches and dents than plastic.

On the desktop side, you can gain entry to the Mac family for $699, the price of the Mac mini. That’s excluding keyboard, mouse and monitor, but maybe you have those left over from another computer. The mini is about the size of a hardcover book and has about the same processing power as an entry-level MacBook. It’s handsome and whisper-quiet and works well connected to an HDTV. The main reason to get it would be to get access to Mac software, particularly for video editing, where the Windows alternatives fall far behind.

If you’re looking for a Windows desktop in this price range, good options should be legion. Look for something with a Core i5 processor, Windows 7 and at least 4 gigabytes of memory.

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$800 to $1,200

The high end of the PC price range is Apple’s domain. The MacBook starts at $999. Its specs are roughly equivalent to the dm4t, so you’re paying a lot for the Mac software.

The cheapest iMac, the desktop computer that’s built into a monitor, starts at $1,199, with a 21.5-inch screen. That’s not much more than you’d pay for an “all-in-one” Windows PC of comparable specs, but the Windows camp offers the intriguing option of touch-sensitive screens, as on the HP TouchSmart series.

It’s tough to say whether you’ll find a touch-sensitive screen a gimmick or a truly useful feature. I find it a very natural way to interact with the operating system, but most Windows programs aren’t adapted for touch.

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Special Mention

But wait, you say. What about the iPad, Apple’s new tablet computer? Well, the iPad is a wonderful device, and it can be had for $500. In many ways, it’s more useful than netbooks in the same price range, and far cooler. The catch is that while it’s a great device for media consumption _ reading, watching, browsing _ it’s not so great for media creation.

Typing long entries on the iPad is tough, unless you get a separate keyboard dock or wireless keyboard, but that’s a semi-awkward solution. You can’t trade files with collaborators via thumb drive, and you can’t use wired Ethernet for Internet access. Then again, the iPad is by far the best device for reading electronic textbooks. It makes a fantastic complement to a PC.