Help in Interconnect cables

My system consists of: Digital Front End: Sony SCD-1 Pre-amp: ARC LS-2 Power amp: McIntosh MC-275 Speakers: Quad 989 Speaker Cables: FMS Microwave II I am looking for interconnects from SCD-1 to LS-2 and from pre to my power. Any suggestions? Also, I am thinking about upgrading my pre-amp, suggestions welcome.