nice gear,, i would get the udac 2 or an hdp(same chip), but you have mcintosh gear so u might have a higher budget
-i have always been in love with the mcintoosh c46 preamp with its analog 7 band? eq
love that one fyi,
ps audio and parasound, bel canto are good too. also check out the yulong dac100 i think, just keep in mind a heck of a lot of these high dollar dac's donot support 24/96 capability and you will be left 16 bit, not always bad but there can be better.
http://www.audiogon.com/cgi-bin/cls.pl?dgtlconv&1285449072&/Blue-Circle-Audio-BC
http://www.audiogon.com/cgi-bin/cls.pl?dgtlconv&1285681037&/Bel-Canto-DAC-3
http://www.audiogon.com/cgi-bin/cls.pl?dgtlconv&1285911949&/Ps-audio-digital-link-iii
http://www.audiogon.com/cgi-bin/cls.pl?dgtlconv&1286284741&/Lavry-Black-DA-10
http://www.audiogon.com/cgi-bin/cls.pl?dgtlconv&1286727739&/Keces-DA-151-MK2
http://www.audiogon.com/cgi-bin/cls.pl?dgtlconv&1286490405&/Hi-face-m2-tech-bnc
http://www.audiogon.com/cgi-bin/cls.pl?dgtlconv&1286495262&/Bel-Canto-USB-Link-24-96
http://www.audiogon.com/cgi-bin/cls.pl?dgtlconv&1287597664&/Audio-Research-DAC-7
http://www.audiogon.com/cgi-bin/cls.pl?dgtlconv&1287872707&/Ps-audio-perfect-wave
http://www.audiogon.com/cgi-bin/cls.pl?dgtlconv&1288136525&/ps-audio-digital-link-III
http://show.audiogon.com/cgi-bin/st.pl?dgtlconv&1244046884&item&Audiorevelation
http://www.audiogon.com/cgi-bin/cls.pl?dgtlconv&1285911943&/Cambridge-dac-magic-black-with
-hopefully this will give you an idea, i did not know your budget, but your bound to find good synergy with something here
bonne chance