Since you're using DIN rails, I suggest getting some "DIN-Rail Mount High-Amp Distribution Blocks" from McMaster-Carr. I bought some 6367T22's from them. I used them for taking the big 6-gauge wires which were the power inputs for my panel and splitting those into four 10-gauge wires as power outputs, which ran to other sections of the control panel.
They take up a lot less space than the old-fashioned terminal blocks.
Nice I'm starting to seriously consider ditching the distribution blocks and going with the modular setup similar to what BadNews did. This is quickly moving to a full-on DIN set up. Hopefully I can get it all before the weekend and have it mounted up. I'm getting antsy to brew another Pliny Clone thanks to the tailgate this weekend that demolished the last one!