Just ran across this and just thought I'd ask: Having played through the game a couple of times and planning to do so again (so I can finally see every possible bit), are Overlord and Kasumi good enough to consider getting?
If you tend to play SMG-using classes, or have SMG-using companions, then the Kasumi DLC is probably a good investment simply so you can get the Locust. The storyline isn't terribly deep, but it's competently written and very well-executed, so I think it's a worthwhile purchase.
Overlord is simply a must-have. It's not quite ME2's Transcend, but damn if it isn't close.