monitor stands

Hi,

I just bought a pair of Harbeth 30, along with Sound Anchor stands (paid $500 for the stands). The stand is a 2-post model, 23" tall, and the support area is approximately 8"x7". These were recommended by the dealer, and were used during the audition. However, the speaker base is 11"x11", and I'm wandering if I should replace the stands with wider ones. Any suggestions? And what would the ideal dimensions be (height/support area) for the Harbeth 30?

thanks- aa