help on engine swap

i just boght a civic hach-back and i'm looking to make it better what would be the best engine to put in my civic that will give it lots of power, also will i have to change the trani, or can i keep the same one?

Get a JDM B18C-R.
Horsepower: 210hp@8100rpm
Torque: 134lbs-ft@7500rpm
Compression: 11.0:1
Bore: 81mm
Stroke: 87.2mm
OBD: 2
Redline: 8900rpm
and if you have a stock engine in your car which is a d-series engine you'll need a b-series tranny to bolt on it. So you'll need a new tranny.

go turbo LS (B18b), it would be about the same price as the B18C but faster.

Id Go With The B18cr Moto From What I Hear It Turns Men Into Babies

go turbo LS (B18b), it would be about the same price as the B18C but faster.Most underated setup, but one of the best out there. And screw the vtec head conversion.