I've got the factory DSP and from reading a lot of reviews from years past, there was no real workaround in new aftermarket headunits that could successfully connect to the DSP continually or with quality results.
Can you use this one with the DSP system?

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I swear, my cars are like a girlfriend.
Sometimes its a rough ride, sometimes its smooth motorin'.
Sometimes she doesnt like how i treat her and sometimes i dont like how she behaves.
BUT at the end of the day, she loves it when I am inside her.

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'91 850i
'05 X5 4.4i
'09 Clubman S