vesa-mount

Hi guys, I am currently on a Dell 19" monitor (VGA) hooked to my Asus Maximus VII Ranger. I am looking to add another monitor to this setup. 1. Budget? 8k (can extend to max 8.5k) 2. Display type and size? Size: Preferably 19" - 22". (or 18.5" - 24") Panel: IPS preferred. Also, fine with TN...