If you wanted more power than the K03 can do i would have bought a KO4.
me perseonally don't like the idea of switching engines around unless it was for a project car. but for my daily, that is out the question.
from what i've read, it seems it would have been better for you to of gone straight to a KO4 engine from standard due to the cost involved!
anyway good luck with the KO4 switch (if you go for it), maybe you could pop down to a meet 1 day