Help on DAC for my situation

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Hello, I have some Dynaudio BM6As on order and a Lehmanns Black Cube Linear. What would the best DAC for me be, the BM6As will be XLR and the Lehmann will be RCA, I have a Soundblaster sound card in my pc. My budget is around £400 (up to 7-800 USD),

I have heard alot of good things with the DACMAGIC which appears to have XLR among others,

Hope you can help.