I have had the Preludes, Arros and Micro Walsh Talls in my listening room at one time or another. The Preludes are handsome and, used, a real bargain. And they're skinny... but if they're too tall for your location, so be it.
The Arros and and the Micro Walsh Talls are exactly the same height, but present a slightly different footprint. The Arros are 5" wide and 7" deep. The Micro Walsh Talls are 6 x 6 inches, so they look a little larger from the front.
I'd suggest giving John Strohbeen at Ohm a call. Tell him about your location and amp situation. He's a good guy and will be honest with you. The Ohms have a 120-day in home audition period, so you can't go too far wrong with them.