Nothing to confused. Just follow your heart. Which makes you more comfortable. Setup wise, i have no idea about NA. So perhaps you have to ask other sifus here which extractor is better suited for your car (4-1 or 4-2-1). So you see which you prefer.
But like i said earlier, you SHOULD ask him what is him custom and tell him if you have other future mods in mind. But if really want an answer on who to go to, i say go with Jian Hang. Im saying this coz i did my things there. And im not being bias about it (i.e. i did it there so i sure will say go back there, unless really f up my car, then i will say no). But i really really really dislike the fact that he doesnt answer calls and dont call back and have
to wait DAMN long for an appointment.
I have already given my personal experience and comment about both. So take your time and decide lor....