depends on how you look at it.... take the money that you would spend on your motor and add it to the money you plan to spend on either motor... if you spend 3gz on a b18c1, thats 3gz less that you have to spend on your motor, then you have to wait that much longer to have the $$$ to modify it, too...

cost of motor + cost of mods = more horsepower

figure if you have an ex, you are spending an extra 3gz for a mere 50 horsepower.... not very economical