I'm amazed I'm having this problem - I expected it to be a two minute flick through a catalogue - but I'm having difficulty finding rack mountable enclosures with removable rack ears.
This is for a job that could reasonably be expected to be rack mounted but then again perhaps not - it may end up as a desktop unit, so to cover both bases I figured on a rack enclosure and if you don't want to rack mount it, take off the brackets, stick on some rubber feet and away you go. Kind of like an awful lot of gear - routers, switches etc - that may be rack mountable but don't look out of place on the desktop once the mountings are off. However if seems that the instant you want a generic COTS enclosure they're all with permanently attached ears.
The project hasn't been rigidly sized up yet but I strongly suspect we're looking at a 2U 19" unit perhaps 300mm deep. Extra brownie points for removable front and rear panels since it makes cutting and drilling a lot easier. I know you always pay through the nose for anything rack mountable but I don't expect to pay much over £50 per unit tops in single quantity either.