I'm looking at buying a first rack case and am wondering how deep a case I should get. I expect to get a 6-space case for amp (Eden WT400 - requires 2 spaces), tuner, power conditioner. and wireless. The Eden is about 14" deep with nothing plugged in -- extended to about 15-16" with plugs in. All the other equipment is a good deal shallower. I'm thinking about one of those aluminum CNB cases -- seems to be solidly made and very affordable -- which run 18" deep without the covers (2" for each). Is this a good bet? Or should I be looking for something deeper or shallower?