Best Pre-amp for Krell FPB600C

I just bought a Krell FPB 600C. What would be a good pre-amp to use with this unit. I am currently using a Krell kps30i CD player and a pair of B&W Matrix 801 series III. I like Krell amps because of its bass performance as I love jazz. My personally taste is a lush, warm sound but still have a bite! Please advise.