AA international is good, even in coach. It won't be the culinary experience of the year, but it's better than some other carriers I've flown (including BA...).
I prefer the 777, with the lone exception of those dreadful middle-middle seats in business class. The idea of 2-3-2 seating in a premium cabin just ain't right...
There's no in-seat entertainment in coach on the 767, which is a drag unless you happen to bring your own entertainment aboard (i.e DVD player, iPod, laptop).
If you do bring along a laptop, be aware that there are auto-style power ports in every third row or so in coach on either one, so choose your seats wisely. If you have a cigarette lighter style plug for your laptop, you're in business. You might also want to consider one of the 65W inverters for charging a cell phone or other device.
And don't forget to get the power adapters for your hotel room before leaving. I forgot on my last trip to France, and lucked out that someone had left one behind in the room. Otherwise, it would have been $20 or so to buy one at the hotel gift shop...