Jamaica House is a reliable chain (well, they have another location across town on Pertosa). When they're really on, they're on - and you can get some of the best takeout Jamaican in the city. They're also are a jack of all trades, as all their dishes are reliable - and their soups are terrific. Every now and then an order comes a bit below expectations; not poor or anything, but just not to the level they reach other times.
Great place though that I'd recommend without reservation, and they have a large menu too.