SIR, Tech_wiz, you both are right, the K20 is definitely much more powerful than the D16W9 that come in our cars. However, as I have said previously in this discussion, there are many factors that made me go for a complete bolt-on system rather than a complicated engine swap.
A lot of my friends are running swaps (B16, B18, H22 etc) and I have seen all the things that they have been through. The mechanical part is relatively easy, but when it comes to the electrical portion, its a constant pain. Not to mention the alterations you have to make to the car.
My car is my daily driver. I can switch back to stock in a day and no one would be able to tell if this car was ever modified. It really depends on what you want. If I had a seperate project car, I would have gone for the swap!