Actually, the total of the Behringer skiff and the uZeus comes out to $154-ish, but a Tiptop Mantis is less than $200 more...and you wind up with double the present space AND a better P/S AND you've got actual busboards AND it can handle depths to 50mm. For me, that would be priority #1. You can have loads of different modules, but if you can't implement them properly due to space constraints, you're going to paint yourself into a corner...especially given that the average depth of Eurorack modules is around 40mm, and you need to give a millimeter or two of extra space for routing ribbons, interconnects, etc.
And even if this IS intended as a "utility" cab, being able to fill out 208 hp with those sorts of modules simply means that you can extend the potential of them, plus have room for more "unitized" groups of modules, such as my fave modulation grouping (Maths, linear VCAs, modulation mixer such as a Frap 321 or Tiptop MISO, Quadrax/Qx) which opens up quite a bit of interaction that yields even more useful modulation signals. Or you could use a big chunk of the extra row for a large-scale performance mixer if the entire rig has enough potential audio signal paths to warrant it.
More isn't always better...but more opportunities is always useful.