With ls/vtec, all your doing is plugging the hole on the bottom of the head where it usually gets oil and plumbing oil into another orifice. I can't find the unreliability in that unless you do a crappy job. But it's pretty easy. So I guess it just depends how soon you want to do your swap. Either the ls/vtec or the h22 would be good candidates. The only thing with the ls/vtec is that it won't be able to rev that high because the stock bottom end. But with boost it would be a monster.