ViewSonic is expanding its Omni monitor lineup with three new models – the VX3219-2K-PRO-2, VX2758A-2K-PRO-2, and VX2779-HD-PRO. The three monitors are pretty different from each other, offering a spec to suit a range of budgets. ViewSonic's new VX3219-2K-PRO-2 features a 31.5-inch SuperClear IPS QHD display with a static contrast ratio of 1200:1, and colour space …