Updated 19/11/15, on account of these things having a habit of… growing.
So, ModularGrid.net is a handy site. It allows you to populate standard sized cabinets with modules you own or are planning to buy. This is as handy as a handy thing for a number of reasons – mainly because it’ll let you see how much rack space a module takes up and – importantly – it keeps a running total of the amount of current your setup is drawing which is useful for avoiding stressing the power supply.
Anyhoo – here’s my current setup. Click for bigness.