LAS VEGAS--The last piece of desktop news from Lenovo at CES introduces the mainstream C540 all-in-one.

A largely by-the-numbers commodity PC, the C540 adds a 23-inch, 1,920x1,080-pixel display to the "Essential" product line previously composed of only the 20-inch C340.

Like the C340, the C540 tops out at Intel Core i3 CPUs, although the C540 does get a bump up to an Nvidia GeForce 620LE graphics chip. It also has a 2TB hard-drive option, which could make this system a useful media storage device. The C340 is limited to slower integrated Intel HD 4000 graphics, and tops out at a 1TB hard drive.

Pricing for the C540 begins at $549 when it launches in February. That model will only have a non-touch display, though. Lenovo says it will launch a touch-screen version in June, although it has not specified pricing for that model.