only one thing you are missing PRICE. whats the max price you would be willing to spend total on 3 monitors? cause if your price is only $600 your not going to get everything you want on that list. personally i would get 3 Dell U2410's if i were to do eyefinity but i dont think you wanna drop 1.5k+ just for 3 monitors
EDIT: after you got your price set we can try to help you more

EDIT: after you got your price set we can try to help you more