gauge wire

Hello, I want to buy a 4 channel TRF M600.4AB amplifier (600 watt RMS, 1200 watt max) and connect to it a 12" TRF VLSW122D2 Subwoofer (250 watt RMS) and 2 front JBL Stage 2 604C speakers (6.5'', 45 watt RMS each). Should i use an 8 AWG power cable to my amp or an 4 AWG? Also what gauge wire...