The only reason I said no to the bigger injectors is, like I said earlier, I think that a really solid tune will be fine for the power you are making now. I'm not sure what injectors come stock on the 350z but I'm sure if the car is running very rich right now and the injectors aren't anywhere close to 100% duty cycle they'll be fine. Later on when you throw on the bigger pulley you might want to look into larger injectors. Since you want to keep your car as DD friendly as possible I wouldn't look to go to anything too monster(550cc's maybe). Anything over that and you have to have a really good tune/tuner(see next paragraph) to get them to drive like stock. Do you know what your A/F's are like right now?

I am very bias when it comes to who touches my cars. I really only trust Martin at XAT to do any of my tune work. He's been doing it for probably as long as I've been alive(hope he doesn't take that the wrong way! LOL). He's got multiple 500+hp cars that get the crap beat out of them on a regular basis and are still running like champs. Give XAT Racing a call and see if you can't set something up or even swing by there. They're great guys and a riot to be around. Tell them that some loser named Silver Moss sent you!