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I used to have the DM 1000 in my rig.(2 actually). Trey used one in his rig pre-hiatus(I don't know if he still is). Decent rack mount gear as Ibanez goes. Usually can find one on Ebay for anywhere from $60-$100 depending on condition.
If you are looking for rack mounted delay the only two I have used and liked are the DM1000 and the ADA 2fx which also gives you flanger and chorus.