One problem with using XLR-RCA cables instead of adaptors is that when you want to try out a different cable for your setup, you have to get another XLR-RCA cables instead of getting regular RCA-RCA cables, ending up with a set of XLR-RCA cables that you no longer need or can use, unless you have something else with balanced outputs. You can always find a use for an extra set of RCA-RCA cables, but not so with XLR-RCA. They will also be harder to sell, if you decide to do so, than regular RCA-RCA cables.
As for XLR-RCA adaptors, Cardas makes nice ones. They are bit on the pricey side, though.
EDIT - And congrats on your new Mini-DAC!