Retro-fit sat Nav - which Stereo to Order

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Sorry Guys i know I should use the search function but pressed for time, I'm about to order an S3 Sportback and plan to retro-fit the sat nav as many have done on here.

Does any particular Audio set up make installation easier, should I specify Symphony or Bose or does it make no difference to ease of retro-fitting the Nav ?

I'm being very sensible with options and have only selected phantom paint and buckets for my track visits.

Comments welcomed, Spin

 

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For anyone who's interested apparently any of the standard double din head units are fine for this retro-fit.

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