I second Mapleshade's racks. They are engineered to manage vibrations and they have VCS (Vibration Control System) platforms that complement the racks. A very effective system. Also the VCS can be used to improve an existing rack you may have.
Audio racks
I'm looking to upgrade my Sanus audio rack with a better wooden rack. I've checked out Timber Nation online and they look really nice, solid and affordable. During Axpona this year, I saw Butcher Block Acoustics now has their Rigidrack line which looks really nice as well---prices are comparable to Timber Nation. Both companies use maple and walnut. Are there others I should consider? How's the quality of each? Thanks!