2-Year Dealer Service; Antifreeze Brand

Please excuse the questions, for I'm sure they've been asked zillions of times. But I'm new at this.

Is the dealer 2-year service at $400 worth it? It seems he's barely spending $25 on parts.

Also, what brand of antifreeze should I use when I change mine? The Honda stuff is way too expensive, but they say use it or your car be damned in the future. What should I do?

Thanks all!