Alternator upgrade and Big 3 cable upgrade ideas?

I'm in the process of choosing a complete audio system upgrade but I want to tackle the charging system before I buy my new sound system. I'm going to run about 2000 watts of power between 2 amps. I read that a 160 amp direct bolt alternator upgrade (which is offered everywhere) should be enough. I would really appreciate some technical advice and vendor information from the 'Rolla community. Thanx guys.