The N97 mini has the best "slide" (tilt !) mechanism out there. Heaps better than the N900's... the only downsides is that its a really thick device. The sliding mechanism on the Droid 3 / 4 is as good as the N900's. Except its a much much thinner device. Best option would be the N97's mechanism with something sturdy like metal hinges instead of plastic, on a device as thin (13mm) as the latest Droids.