Offline + sync iPhone/PC app?
So I got an iPhone about a year ago. I've been using google Tasks to manage my lists, but I find myself resistant to using them, and I know why--it's just not flexible enough. I often find that I'm offline and need to add something, or I'm processing and I don't have a strong enough signal. I can't add things or check things off my lists on the fly.
(I was an analog GTD-er for years and am seriously contemplating going back to my moleskine pocket notebook for my action lists.)
I've tried also using an add-on to gTasks called Google Tasks Offline, which kind of solves this problem, but not quite to the degree I'd like.
Can any of you point me toward an iPhone app which
a) can manage about 7-9 context lists
b) tasks can be added/checked off even when the phone is offline
c) will sync to PC
Thanks in advance.