I agree with Noble 100, choose the speakers to fit the room. 12x22 is a fairly large space. Use the amp you have and if it's not enough then save up and upgrade the amp on your next purchase. Buying spreakers that won't sound good in your room will create problems that can not be solved by upstream equipment. I'm sure you can find something that will do both fit your room and work with your amp at the price you are shopping at, if shopping used. I would never buy a new car, I always buy one year old and save a bundle. Same on audio, most audiophiles take such good care of their gear, there's little risk in buying used, and save a significant amount over new.