Good news!

[Ryan T]

I guess to break it down, you'll have to ask yourself these questions:
1) Do you want 2 doors or 4?
2) Do you want a quick daily driver or a fast modified daily driver?
3) Are you prepared for the inevitable drop in reliability with boosting a car that wasn't meant to be boosted?
4) Are you prepared to pay for the $10k+ to boost an IS properly so that it can be daily driven?
5) Are you willing to buy a car that doesn't respond very well to bolt on power mods? Do you plan to buy the Z and modify it? (350Zs come well-tuned from the factory and take a lot of money aka boosting to make them a lot faster).
6) Do you want to sacrifice a little luxury/comfort for sportiness/speed?

Those are some I can think of off the top of my head. I find that my IS is more than quick enough for daily driving duties, and with a couple of suspension modifications and a little extra power it would make an awesome track car (if that was my goal for it).

A lot of good questions, but it doesn't take $10k+ to boost a 2jz-ge and make it reliable. Tons of guys have extremely reliable kits built for under $5k. At the same time though they mostly do their own labor, install prices can be expensive.