There are prior discussions like https://hardforum.com/threads/three-monitors-with-1-gtx-460-possible.1582697/ that point out the 460 with quad monitor capability.
Hello - i currently run a 2 monitor set up and am planning to buy a cintiq. I would like to keep both monitors in addition to the cintiq as i will not always be using it. I currently run a geforce gtx 460 and am looking to upgrade a bit but within reason. I primarily use this computer for photoshop and illustrator, although i do play some games on it. I am not looking to overclock, just need a good a slight upgrade and ability to run 3 monitors.
Another post mentioned a GTX 1070, although i think the price is a bit higher than i really want to pay.