I had to spend a lot of time to find monitors that use technology with a decent vertical viewing angle.

Nowadays most LCDs use cheaper techs like TN panels that only give a good viewing angle when used horizontally. You have to look for monitors with IPS or S-PVA panels. The one you have has a TN panel, which is the worst kind for vertical use, I'm not surprised that you were disappointed.

Be careful and triple-check that the monitor you intend to buy uses the right panel technology, some manufacturers lie about it and others sell different techs for the same model number.

I have two Dell 2209WAB and one HP LP2275w (in different locations, I only use one monitor at a time + laptop). Both models provide excellent angles for vertical use and definitely use the panel technology advertised.