There is only one answer here.... Sennheiser HD25-1ii !!! Ive owned a pair of these for over TEN YEARS and they have been flogged at gigs every weekend... And they still go strong!
I personally dont rate the KRKs when u compare them to something like the Yamaha HS series. And theyre certainly not in the same league as my old Samson Rubicon R8As with the o-so-sweet ribbon tweeter - If Samson hadnt discontinued them I'd recommend them without hesitation.
Get yourself a pair of monitors like the Yamaha HS80Ms Theyre clear, loud and dont go over the top with real deep bass that will rumble through your neighborhood late at night!!