Had a chance to take a look at Audiogon and eBay. Looks like a set of biwired Aerius Is go for somewhere between $1200-$1500. I checked the Orion Blue Book and they should be selling between $850-$1200, depending on condition. As a former ML Scenario owner, I used a Parasound amp which easily drove the speakers. I think as long as you have at least 100 quality watts of power, you can't go wrong.
Ben