Thiel CS1.5 and properly sized Aragon amp

Hey. I'm in the market to upgrade the amp for my Thiel CS1.5s. I've decided to give Aragon a try since it's a good used value (this is my auditioning). Does anyone think I need the 4004MkII or should the 2004MkII be enough power? The cost difference is irrelevant, it's strictly a matter of whether the 2004 provides enough power. I've seen people using the 4004 with the CS2 series and the 8008 with the CS3 series but I'm not conviced that the 2002 is enough for the CS1 series. I will be using Goertz MI2 and MIT 750HE cabling. I'm replacing an Adcom GFA-7000. Thanks! leo.