I have a couple of thoughts for you. Quicksilver makes a phono preamp and made a preamp with a phono stage (which occasionally show up for sale used) and you might consider those options if you like your current Quicksilver.
The Shindo preamps mentioned in this thread are great, but do not always play well with other brands, due to their high gain among other things. You should talk to a dealer or the importer to make sure the Shindo will work in your system.