If you are definitely turboing, I would suggest the K20A3. It has the lowest compression and will be more turbo friendly. I would not suggest a Franken K-Series (K24/K20 Hybrid) for turbo, but it can be done, just under a higher octane gas than the straight K20A3. Also, any Honda Engine can take a decent amount of boost with stock internals, just make sure when tuning, basemap can be off a dyno, but when fine tuning, I would highly recommend datalogging from street pulls as opposed to dyno pulls and tuning from that. Also, a Wideband O2 Gauge mounted in-car is also recommended.