You can always use Toslink input to internal DAC of N2000 if ground loops are concern. Yamaha has a very good unbalanced inputs rated at 110 dB on their solo amplifiers like A-S700 or A-S3200 so difference between those and balanced one's won't be noticeable as long as you don't catch a ground loop. On integrated rating is lower (as other components do influence it - EMI) but those have plethora of other inputs if you intend to use embedded DAC on them (in case of N2000; HDMI, USB, optical coaxial and Toslink...) and Yamaha does do a good DAC integration (back from Burr Brown day's).
When mentioning ATI you can check their Hypex solo lines, they come with good warranty, balanced and unbalanced inputs but aren't exactly cheap. Good value amp is old A-S700, this all is over priced but you pay either for performance you can't hear or cosmetic (tuch, feel, VU meters and owners pride).