www.tunedbyfrost.com
Frost is his online nick....his real name is Steve. Just have to read on the site a bit to know that he has an excellent reputation on here and has many many happy customers on the site.
As far as your A4 being more prone to breaking.....when you mod your car at all things get more prone to breaking. The old saying is fast-reliable-cheap.....pick 2. That being said I've ran for years on a stalled tranny with heads/cam with all the standard tranny tuning done. Tranny is still ticking.