are you sure you know how to use logic to its full extent(not meaning to sound patronising)
i am an experienced user of all those apps, especially DP, PT and logic.
logic has much to offer, but it also has a steep learning curve. it also depends on what you want to do. PT is very efficient for audio editing (logic can be too with the right key commands) and logic is great for composing.
i have to admit i gave up on DP a few years ago, as the performance of version 4 was not as streamlined as logic.
maybe logic is not the right app for what you want to do?