Hi I have the oportunity to purchase a used half stack , but dont know much regarding these heads. Here are the two choices I have ..1-jcm 2000 dsl 50 with a lead 1960 cab. at $950. or 2- jcm 900 duel reverb 4100 with a 1960a cab. at $1300. What would be the better choice? Your advice would realy help. Music played would be from 70's and up rock, metal, etc.. music. Thanks