I am using Polk RM7600 speakers for mains and a ML Dynamo sub in a small bedroom setup. Although using RM7600 speakers for surrounds would be ideal, they are rather large and take up too much space on the side tables. I can buy NHT Superzero or KEF 20005 speakers for a great price. Which of these do you think would mate well with the rest of my speakers? I can't listen to them before buying. Thanks.