I personally just use official canon ink. Call me crazy, but my i960 is ONLY for photo printing, we have a laser and a FAR lexmark for all other printing we do. I guess I prefer knowing I get high quality ink for my photos.
Thats not saying I spend alot, I bought an entire set of replacement carts for ~$40 (6 tanks) so in my book thats not bad, especially since the original tanks are still going strong after 12 8.5x11 and 50+ 4x6 photo prints. I also only use the official paper, can't bet $20 for 240 sheets of 4x6 canon photo paper plus glossy!
I do, however, have an iterest in what is the best "other" ink as my bro loves his new Pixima3000 to death, I am afraid he is gonna run out of ink real fast here.
-spike