When you say "decent sound", do you mean adequate volume level, or do you mean that the sound is otherwise unsatisfactory until you hit a high volume level? What I am asking is if sufficient gain is your only concern.
If what you seek is more gain, this seems a bit odd because Quicksilver linestages have something like 18 db of gain, which is quite a lot. I cannot think of any situation where that much gain would be exhausted before one hits a level that would cause any amp to clip But, if your source is a phono setup that doesn't have enough gain, that is a possibility. In that case, you should be looking for a phono preamp, not a linestage with more gain.