which is the best tranny to get for my b18c1 engine. Like that can hold alot of power and give me better accelaration performance.

Ok so you want to convert to manual from auto right?
Try looking into a JDM B16 Cable tranny, unless you do a lot of highway driving. If you do a lot of highway driving then I would suggest The B16 cable tranny with a LS 5th gear conversion (http://www.honda-tech.com/zerothread?id=555929).
Also read this (http://www.hondaswap.com/forums/index.php?showtopic=29796).

what about if i just get the b16 tranny and don't do the 5th gear conversion

You will be fine without doing the LS 5th gear conversion, I was just letting you know that is a possibility. The B16 tranny is going to be annoying on highway drives just to let you know.