I am looking to enhance my SWR GoliathIII 4x10 cab with a 1x15. A local shop offered me a new SWR Workingmans Series 1x15 for $299 or a used (but damn near new) Ampeg SVT-15E for $299. I am running a Sansamp pre-amp and a QSC power amp. I am going to play through both of them this weekend, but wanted some general thoughts. How is the Workingmans Series? I am familiar with Ampeg's quality. Thanks in advance.