For turbo,I'd suggest starting with the B18B,lower compression to start and decent power,torque till you get the turbo.If your going to wind up staying all motor than definitly go with the 16 or 18c1.The 16 is a increasingly underrated motor as everyone seems to be going with the 18's,but the fact that the fastest vtec's at the track are mostly B16A's,that tells you something.Ok that isn't far there are alot of 18's at the tracks too,and they do have nice around town pull.So I guess what I am saying is it boils down to what you can get and how much you want to spend.