5. Lenovo IdeaCentre C540
Price: $613.99, on Amazon
Though Lenovo was the second best-selling desktop brand for the month of March and has enjoyed significant growth in its desktop sales over the last year, its most popular product in March clocks in at No. 5 on the list. This 23-inch Lenovo IdeaCentre C540 runs on a 2.9-GHz Intel Dual-Core processor and is smaller than the devices on the current IdeaCentre Horizon line, which all measure in at 27 inches.