Uhm it depends ... U want monitors to djing or to production?
Hey.. in my opinion (don't have much experience)... if u want monitors to production u need to listen the sound how it is ... I think that a subwoofer change that so I don't recommend u to buy a sub (just in that case)
Other else if u want monitors do djing than I think that a little bass won't hurt u ;) We like always to feel the bass!
But just my opinion ... there will be more and best advices in this topic for sure.