Hello mate
I would stick to one of them to be honest.
http://www.viezu.com/
http://www.sharkperformance.co.uk/
Remap is a fairly serious thing and I've heard few opinions about Angel Tuning and some are really bad and even if there is only 5% chance it will go wrong because of incompetence of the guy, I wouldn't want to be in that 5%.
Most importantly, do not go with the the cheapest, old saying you get what you pay for applies here very well, good remaps are just not cheap, and you doing it once.
Not sure how Angel Tuning is operating, but Shark and Viezu do write the remaps on the spot for you, not uploading just a universal remap.
Do it once, do it properly 
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2006 D3 S8 5.2 V10
Ceramic Brakes, Bang&Olufsen, DTV, DAB, Rear Camera, BT, TPMS, Soft Close, Auto Boot, AMI , 4 Zone AC, Home Link, All Electric Blinds, Fingerprint, Ski Hatch, Black Extended Leather, Heated Sport Seats, Alacantra, Carbon Trim inc Aluminium Pack 2.
2015 A3 S line 1.4 TFSI - for the missus to keep her away from my car.
Standard S-line equipment, no extras.
2006 D3 A8 3.7 V8 - SOLD but not forgotten
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