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If you haven't heard the term ''ultrabook'', it's a new ultra-portable notebook category created by chip maker Intel that is starting to arrive on store shelves. Of course, a few have more than a passing resemblance to Apple's MacBook Air but seemingly all's fair in love and retail.
The two I'd agonise over choosing would be Asus's compact ZenBook UX21E and Dell's new XPS 13z.
The UX21E is a tough little competitor, squeezing excellent application speed and battery such as dell J399N battery
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life into a 29.4-centimetre aluminium chassis that weighs little more than 1.1 kilograms.
On my testing, it's about six times faster than a typical netbook. Dell's XPS 13z features a larger 13.3-inch screen but tips the scales at 1.35 kilograms. Its app speed is all but identical to the Asus - both use similar Intel Core i7 processors.
Most ultrabooks use a ''solid-state drive'' that's similar to a USB flash drive but considerably faster. They're more expensive than traditional hard drives, so you don't get as much space for your money. The difference here is that for $1699, Dell will give you a 256-gigabyte SSD while Asus can only manage a 128GB for its $1599 price tag.
Battery life is key with any notebook and here neither disappoints, with the Dell lasting three hours and 40 minutes and the Asus five minutes less on our continuous video-playback test with full screen brightness.
Intel is expected to release its next-generation Ivy Bridge processors, which will improve app speed and battery life further, about June.
In the end, if I had to buy now, Dell's XPS 13z would get my nod for its slightly better value. It's a stylish model with plenty to offer. But I would really love to wait for Ivy Bridge if I could.