Don't go smaller YET. One of the best methods for getting a build right is to start in a case that you think is "too large"...because, invariably, it's NOT too large once you get the "feature" modules in alongside the "boring" stuff that's there to make the former set of modules really do their thing.
Three rows of 90 hp? You just described the Pittsburgh EP-270. But you didn't mention the BEEFY power capacity it has, which is a huge plus! Plenty of space, too...the angled front leaves ample internal space for deeper modules. However, it's not exactly set up for controllers, given the lack of a "flat" row. But you could also go with their EP-344, which also has the 1U utility row as standard, 5 Amps on each of the 12V rails, plus a "flat" row that's made for controllers, performance mixers, etc. More expensive, true...but as a long-term project (which all modular systems SHOULD BE viewed as), it works with its 4 x 86 hp form factor...still small, but still spacious.