[sohc_vtec 2NR]

you can easily "bolt-on" a d series engine on your current car without the hassle of finding the right parts to go with a b series swap (ie different size transaxle, etc) if you plan on building up the internals; d series parts are "cheaper" compared to a b series and the d's are also lighter....

i'm not sayin' don't get a B series, but don't leave out the potential of a well tuned/built d series.... if your not gonna mess with the internals might as well get a b series because the power can be acquired on stock internals..

all in all it really depends on your budget, power goals, type of motorsport you want to go into, etc...