that card could run 3 1080p screens like butter... :L
it wont increase performance per se, but it will finally output in HD graphic resolution, it will look better, by default.
you probably misunderstood when being told a 900p is overkill for a 770... the 770 is overkill for a 1080p monitor, unless you want to run Crysis 3 on Ultra settings... it still makes the world fluid...
Im not sure what kind of monitor i should get
Budget is 200$
It will almost certainly be LCD
IPS = true to life colour, wide viewing angle (up to 160 degrees so not great for privacy) MUST be good quality to have a response time between 1-7 ms
TN = Better contrast (Good quality ones can have good colour too) Almost impossible to get one with a bad response time.