Guys, rather than have a DSG vs Manual brawl and scare the OP off modding completely, shall we just answer the question a bit better?
If this chap is looking at a Stage 1 map and one that is offering only 270bhp, I think it's fair to say neither a manual or DSG box is going to explode into a million pieces and will handle the power fine. Sure some of the earlier clutches don't like an agressive torque curve after a while, but there's also a massive amount of guys that have had no issues what so ever. All down to driving style if you ask me.
If I were new to the forum and read this thread, I would be sh*t scared of modding my Ed30
When we all know that failures are pretty rare and not always down to software, but more lack of mechanical sympathy or being dam unlucky with faulty parts..