I've had the 10x5, 20xl and 20xH the17D and the xx2mk II. The 20x is a marginal step up the 17d is huge as is the xx2. The 17d is so clean and clear sounding you will be amazed. In a way I like it better than the xx2 but I think the overall balance is better with the xx2 you can't go wrong with either. I think you will certainly like the 20x better than the 10x5 but if you are looking for a big jump go at least to the 17d.