When I started out with Task Managers and GTD, I gave many apps a try, including Omnifocus. As much as it has to offer - and the many options to sync to the iPhone were appealing - it was the price tag that convinced me to try something else instead. I went with The Hit List until I really, really needed a way to sync to the iPhone. Things did it then for me but it really annoyed me to have to think about it every evening when I came home and was on the same network. I seriously considered Omnifocus again, but then discovered TaskPaper with its iPhone app ... happy TP user since.