I own both WordSmith & pedit, but pedit is what I use instead of the built in memos. It is probably not a good fit for you, since it's a text editor. I like being able to create larger memos and hide them in the p32 database. It also has a great way to link 4k memos together, so when you reach the end of the first memo, it brings up the next segment. I have a few simple scripts that I made to use too.
Another application you might find a use for is Handyshopper. Yes, it can be used for shopping lists. It's also useful for a lot of other lists. Some people even use it for their GTD'ing.
I've set a systems up in at least a dozen different combinations, with different applications. Every one had both strengths and weaknesses. In the long run, the application you choose isn't that important. It's most important to build the basic habits. You just want applications that don't get in your way.