The DL50 is gathering quite a following and there are several good reports about it's performance. You can do a search here and read what users have to say about it. An option that several people seem to shy away from but remains an excellent choice is to buy a second hand engine, and in your case a DA or equivalent might just fit the bill. Saves you the hassle of breaking-in or just for the hell of it you can fit a new ring and start over.

Karol