Your NCDC Head unit and its MID (assume thats what you have) can be programmed to Bose Mode via a Tech 2. So your just left with changing the speakers, loom and adding a Amp. Job done.
I would go down the Bose route first and see what you think. 
Update: Just noticed you have a FL Elite, do you not already have a Bose Set Up?
in his case, no. No idea why not...
He will have a GID or a CID with NCDC stereo. Said stereo has not line out, which will limit choice of amps. Bose setting provides unusual levels only compatible with bose amps.
Bose isn't that loud, if your other car is a corsa, you wear baseball caps, and you think cruising for honeys up and down the high street with your bongo bongo music at full pelt is cool, Bose most definately isn't for you. Try to see if a member locally has a bose setup and listen to it before committing.
Of course, 2013 has Sat Nav, forgot about that, well spotted. The adding the speakers, loom and Amp bit, I did mean all Bose stuff, sorry didn't make that bit clear.
Wonder why you dont already have Bose?, Northern Ireland, is it an Opel?
Hear what your saying about the lack of Bose Migs over there, what about listening to Bose on early Audi, Mazdas, Mercs etc. Would that not give you some idea about going down the Bose route?
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Topic: BOSE or Aftermarket!? (Read 3787 times)