So, from sennheiser you have a few choices, the 6xx, 600, 650, and 660s. The 6xx, 600, and 650 have a darker tone and definitely need an AMP. 660s is great with or without and AMP and personally I like the 660s the best. I highly suggest the focal elex since you like the sennheiser house sound. You’d notice the difference between the 660s and focal elex pretty quick.