AC - DC power inverter?

hey i am putting a guitar amp into the back of my car. i want to play my i pod through it. i do understand to power it i am going to have to find a AC - DC power inverter to run it off the car battery. its a 30watt amp what size inverter am i going to need and is that going to be to much to run through a cigarette... show more hey i am putting a guitar amp into the back of my car. i want to play my i pod through it. i do understand to power it i am going to have to find a AC - DC power inverter to run it off the car battery. its a 30watt amp what size inverter am i going to need and is that going to be to much to run through a cigarette lighter? what can i do with that. and is there a plug that i can buy thats going to go from the normal instrumental plug in for the amp straight to my i pod? thanks
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