In my opinion the k518le's are amazing for hip hop (huge bass without ruining the mids and highs) and they are almost always on sale for
half price at Amazon and other places. Great value. They have excellent isolation with the stock pads.
They need some burn in to sound their best but when they do they are simply amazing for the music you listen to. With burn in the bass tightens up and the mids and highs come out a bit. They have foam pieces covering the drivers which can be taken out to make the bass much less boomy and the mids and highs come out much more(I have removed them).
They clamp hard though so comfort may be an issue. You will have to stretch them over books or the like to reduce the clamping force. You can also replace the default pads with hd 25 velours at the expense of some bass and isolation but the comfort, mids and highs improve. I am using them with the pads of the coby cv-185 and they have decent isolation, the bass is great and is not boomy, and the mids and highs come out a bit more as well compared to the default pads.... comfort with coby cv-185 pads are better than the stock pads but can get uncomfortable as the pads are shallow and I have elvish ears
) .
These have great bass(the low end feels heavy) with great highs and nice mids(a tiny bit recessed to my ears) which equals to a really fun sounding headphone.
Hope this helps!
I haven't heard the others so I really can't comment on them.