Sensible...the only major reason for going with the RackBrute, as far as I'm concerned, is if you plan to use it solely in tandem with a MiniBrute2 or 2s. Otherwise, you only get a paltry 3 hp of extra space in a 6U over a 6U x 84 hp, which is one of the "standard" sizes. It's far more sensible to go with a 2 x 104 hp cab these days, particularly if you get a cab that gives you a tile row such as the Intellijel and, to a certain extent, the Make Noise cases do.
Another thing you might consider would be an external sequencer. There's some magnificent ones out there right now, such as the Squarp Pyramid and the Kilpatrick Carbon, that offer massive feature sets plus internal storage galore. And that fits one of my rules of thumb, that anything that requires being in a Eurorack is what should be in a Eurorack, and anything you can keep out of it leaves more room for the things that have to be in there.