amps for totem mani 2 sig

currently i have these totems for over a decade and want to see if i can improve upon the amp. krell 400xi integrated, with an esoteric front end. living in a condo so size heat matters. looking at ss bryston 4bsst2, belles 350 a2, ayre vx, hegel 4e, gamut 200i etc. you get the picture. any experience with this topic is appreciated. (i know it has come up before but the situation i have is somewhat different.) thanks