Funny thing is I made 210whp with a Stock K20A2.... without cams and it being tuned... I noticed you didn't put any kind of tuning on the K which would be COMPLETELY NECESSARY if you want that thing to run right with CAMS... I know my Motor put down around 190whp with a basemap... But my car was done right... Also with the SI motor, you are talking about a throttle by Ecu Setup, which currently doesn't have any Hondata tuning available to it except for the Re-flash, so I would definitely go for a K20a2 or a K20a, because even with a K20z1, you are going to have to buy ADDITIONAL part's in order to use K-Pro, which by the way is by far the most commonly used tuning software for the K series... and well in my opinion the best But yeah a Stock K almost always beats a Built B. Start building the K, and well good luck finding an All Motor B that can take you...

In response to the guy saying you can do it cheaper... Yeah if you have half a year to a year to wait around for parts to become available then good luck finding better deals... Otherwise buy it in a condition that you can be sure of... Brand New.