Before buying, you might want to think about selling the Rega and buying a better one box player instead of the DAC. The new dac and digital cable could easily cost $500-$1500 for the models you mentioned (used or new). It's worth considering that option.
If I were you I would highly recommend checking into a modded CDP or universal player for the same price you're willing to spend. That would definitely get you the best sound for your money, but not everyone is comfortable with mods.
If I were you I would highly recommend checking into a modded CDP or universal player for the same price you're willing to spend. That would definitely get you the best sound for your money, but not everyone is comfortable with mods.