Hmmmm if i am not wrong Steve Vai uses a Keeley modded DS1 Ultra mod.......u can try that. But price is often an issue to some, great if u can find a used one cheap......if not there are some local modders that make great mods to the DS1 as well for much cheaper!
But like what shredcow said, it is not just abt the DS1 that will give u their tone......the guitar u use, the PUs in the guitar, and the amp all makes the difference....so the DS1 is just a part of the tone no doubt a pretty important one.