the case measures 11.80" x 9.80" x 4.70" (exterior)
The only reason I actually got a case, not just a pelican, but any case is because I actively transport them with other gear and don't want to crush my headphones. The HFi line are built like tanks so if you don't have the fear of crushing your headphones with over 100lbs of other stuff, I'd just throw them in my bag and go. I'm drawing a blank on other cases that are in your price range and that aren't bulky. Sorry.
If you still want a case though, it seems that the Ultrasone one would be your best bet even though you don't like the price. It will provide good protection and won't be as bulky as the pelican.