Depends on which side of Dragon Ash you like. The punkrock side or the hip-hop side?
You might want to check out The Mad Capsule Markets which is a bit more extreme then DA. Mob Squad features members of DA and Mach 25 are on the same label, so you might also like those. If it's truely the hip-hop side you like, i suggest you also listen to M-Flo and the Suite Chic project.