I own an SWR Marcus Miller Preamp as well as an Avalon U5. I get great tones out of these two but I am looking to add a tubey, warm preamp to my rack--something that's bit away from the clean sterile tone of the SWR and the warm but still clean tone of the Avalon. I don't care for distortion or overdrive but do want that natural tube compression you get from tube bass heads. Something that will sound great slapped but also will give me a deep fat tone. Of the three preamps above, which one will give me what I want? Thanks for your opinions.