This will be my first dual screen monitor setup so I'll search what you have suggested upI'm not aware of any in that price range which have a display stand which supports pivot. You'll definitely want an IPS panel since TN have horrible view angles in portrait.
It'll probably be cheapest to get an IPS you like with VESA mount holes (100mm x 100mm). Then buy a cheap VESA stand. I'd suggest a dual monitor stand to work with both displays and free up desk space.