What amplifier can support my Two Kicker subs 300-600watts peak power in terms of Wattage?
You want to select an amplifier that matches the RMS rating of the speakers you are using. Peak power is the absolute maximum power that the speaker can handle for a very short period of time. You also do not want an amp that is too underpowered or you can damage both the speaker and the amplifier. There are many options, one that would match, however would be the Alpine MRP-F450 4-channel amplifier. You can bridge each side of the amp to get the power you need 200 watts RMS at 4 ohms. I get all of my gear from Crutchfield.com – they have been great to me over the years.
