It depends on how important HDMI and lossless codecs are to you. From what I understand the Krell is great for HT, not so good for music. A good choice for sound quality might be a Proceed PAV/PDSD, but you wont get HDMI nor the latest processing. There are excellent expensive choices like the Classe CT-SSP. I went with a Cary Cinema 11a for its sound quality, HDMI, and latest processing, but they are buggy -- even the manual suggests not using its automated room correction.
I'm not at all familiar with your speakers, and that may be the place to start as RW suggests.
db