I would of course say sohc vtec as well. It is true that a boosted sohc will cost almost as much as a b18 swap, but look at the power difference between the two. You will be faster than most of the n/a dohcs out there, and you will be able to say you did it with only half the cams. You could have a REALLY nice turbo setup for a sohc for around 2-3k. Now those dohcs will always have the advantage however. If you put that same turbo on a b18b you will of course be making more power than w/ it on a sohc. But that would entail the cost of the swap and then the cost of the turbo. I guess you just have to ask yourself how much you want to spend and how fast you want to go.