Well I'm glad that after 7 pages of reading everyone's ideas and opinions on FI/NA I get a chance to voice my own opinion. Being a veteran of both NA and FI I'd have to say that the 350z is the best NA car I've had the opportunity to drive...that being said I plan on making my project motor FI. Why?
For the simple reason you've read at least 6 times already: Fun factor! $$$ + work + time= big payoff on the street/track/wherever!!! The way I see it, paying out the last dollar of your paycheck to have someone else do the work FOR you is probably one of the worst wastes of money a true motorhead could do. IMO the hands on, dirty and greasy work is the best part in all this! (Besides the drive of course! What good is effort without results?) With that said, I submit that there are a lot of things the average Joe just cannot do in his two car garage with the minivan parked next to the asphault grizzly! For that...yeah, take it to a pro and get it done RIGHT the FIRST time! There is no substitute for experience, and blowing your motor into little aluminum bits is not an experience you want to have under your belt! Learn from others' mistakes and don't repeat them!
Really you could look at it this way: NA or FI, you drive like an idiot and don't tune it properly, you're going to have to spend a whole lot more cash than you ever wanted repairing the damage your inexperience and lack of knowledge (aka ignorance) caused. It's all about how you do it and the quality of the worksmanship you put into it.
I find it a little insulting when I hear drivers talk about how FI is just asking to blow a motor or wreck your car. Sure, if you drive like you've got a kilo of heroine in the backseat and the cops are after you all the time, that's going to happen! But for those of us who don't mash down the accelerator everytime the light turns green, FI is a very viable option for the VQ35! Not to mention with a boost controller the amount of power is in your hands and you can turn it off just as fast as go balls to the walls...all it takes is a little self-control!
In my own personal experience of being raced (I was in the passenger seat) by a very expensive-off-the-lot car (Z06) that felt like flexing on the street against a '94 Supra TT pushing 679rwhp/662rwtq and feeling my guts press against my spine
...I KNEW that FI was the most fun a man could have on the ground! After that I got a nice little FI for myself and it's a quick little bugger...I like quick! But as for the VQ...I'm building one from the ground up to give me the G-force adrenaline rush!