mcintosh & big $ interconnects

heres the deal, ive tried a ton of gear & i mean a ton & for me the mcintosh sound is it.

im having a real hard time hearing any differences when i try different interconnects,i'll avoid naming any particular brands ive tried but its always the same.

my last interconnect fiasco was with a pair of $300 cables against a pair of el'cheapo cables & i heard nothing, not a single difference.

im just finishing up a new system & i want to try new cables with it but im clueless as to which models work with mcintosh.

please reccomend some cables for the following rig.

mcintosh c2200 tube preamp

mcintosh mc500 amplifier

mcintosh mvp841 cd/dvd

mcintosh mvp831 cd/dvd

cary audio tube dac

mcintosh xrt 22 speakers

my budget will be in the $1500 to $2000 price range(used).

thans, mike.