Sennheiser (except the PX100 (cheaply made yet 3 times as expensive as the equally as good (if not better) KSC75. Then the HD500 is incredibly bad in every single possible way!) and KOSS.
I never experienced any Grados yet, but if they are harsher then the KSC75, I think I will definitively pass!
The Sennheisers because they are so relaxed...
And the KOSS, well, because I like my KSC75! They sound good for the money, yet nowhere anything awe inspiring...
But I only heard SONYs, ATs, SENNS, Altec Lansing, Panasonic, Plantronics and KOSS, which isn't many manufacturers!