I am looking for the best DI/preamp to run direct (without using any amplification or cab mic) for recording metal music, and after doing research, the Darkglass B7K seems to be the ideal DI for me. Is there a significant difference between the B7K and the B7K Ultra as far as clean sound, preamp, and recording goes? Will it be worth the extra money to have the Ultra, or is the regular B7K suffice enough?