If I can find a secondhand HiCap 2 for the Supernait, I could be tempted. Otherwise, a Neat centre speaker would be nice to match the Elites, but I'm really pleased with the system as it stands, to be honest. Mrs. Naxos refuses to believe this, of course.
However, I'm definitely aiming to get a Denon DM-38 for the office to replace the Pioneer NS-7 (I got some Q Acoustics 2010s for Christmas to upgrade the little Pioneer ones, so I'm halfway there - wonderful little speakers).