i bought mine with my AMEX so there is 1 more year additionalwarranty. Is that worth it to get the applecare ?
Most decent credit cards will extend the warranty for an additional year on new merchandise (refurbs often don't qualify).
What's good about AMEX is that if you do opt for AppleCare, the AMEX coverage takes effect
after AC is up, so total coverage would be for 4 years. I checked with my Visa provider, and they said AC would void their extended warranty.
As for the value of AppleCare, like all insurance, it's a gamble with the odds in their favor. Everyone has their own risk/reward thresholds. You do get the benefit of phone and possibly on-site support, but if you have an Apple Store close by, it might not matter.
For a laptop, or laptop-based computer like the iMac, I'd learn toward getting AppleCare. They're more difficult to service, and the shrunken components have to deal with a harsher environment. If the LCD screen, hard drive, or DVD drive fail, it will have paid for itself. And as a manufacturer-backed warranty, it's going to be more solid than a 3rd party extended warranty often pushed by retailers.
If it was a robust, old-school pre-contractor-built Apple desktop, I'd learn toward no AC. The components that typically fail would be a snap to replace by oneself. It's an old cliché, but they don't make 'em like they used to.