The 660ti will run a three monitor setup. Gaming on it will definitely tax the card (will run med settings 1080p on all three). However, if you are only using the one in the middle for gaming then there will be no problem.
Here's a great 24" display (I own one and it's super slick) - http://www.amazon.com/dp/B00AVYNS7M/?tag=pcpapi-20
Btw - forgot to ask your budget for the monitors