One could argue that the past 12 to 18 months have been all about netbooks, but all-in-one PCs sure are making a comeback here lately. Following up on efforts from Lenovo, MSI, Dell, Averatec and countless others is BenQ, who has just unveiled its stylish nScreen i91. As you’d expect, this is the company’s very first all-in-one PC, and clearly its design team spent some long nights piecing things together.BenQ seems to be marketing this as more of a household / lifestyle PC than a workhorse, leaving most of