I can't offer you much advise on the pre amp, I use an AV5103 (as my system is set up for both HT and music) and love it. I also have the AV5140's as my fronts, and would recomend more power to drive them. Try the AV5105's, far more power than the Lk 85, or perhaps the Lk140. The 5140's can really handle power, and require quite a bit to play loud.
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