DJ Headphones: Sony MDR-V700DJ vs Pioneer HDJ-1000 vs Sennheiser HD 280 Pro vs Sony MDR-V6

Hey guys i've been reading for hours about these four models, anyone has experience with them? I've seen many threads praising the HD 280s. Is it worth paying almost double the price of the MDR-V6, which also got good reviews, for any of the others?