I personally like the b18a. Its cheaper to start with, around $400 or so cheaper maybe more if you can find one at a local junkyard, and it definately has more potential. If you do some nice head work, ie cams, springs and retainers (around $1k) you have a high revving (sp?) motor with alot of torque. And then there is always the possibility of turbo!!! I am working on the same project, crx with ls swap, but I am building for turbo. Good luck.