When I had a 1jz in my s14.. single turbo, I had it running really cool. I was using a 7m supra radiator, double maradyne fans, gutted thermostat (so it has some kind of restriction). Normal driving would be are ound 150-160f If I raced it would raise to 180f and drop as soon as started cruising. I was at 460hp. If you want to go cheaper get a NA 2JZ and a r154.. turbo that motor, use the distributor it works fine I've seen 2jz with dizzy go over 500hp with a after market coil. The main thing I will recommend is getting a standalone. I use the EMS Fuel Injection Stinger 4424v, great ecu and easy to wire up.
lol stock bottom 2jzge NA-t met this guy when he bought all the parts from the shop I use to work at.
http://www.youtube.com/watch?v=RFscGt2tRGI
2jzge can be bought for 300$ - 500$.. your going to buy a manifold anyway so most of the parts your going to buy to make the 2jzge turbo you more than likely would by for a 2jzgte.
I'm planning to go 2jzge auto with 2jzgte auto transmission.. but im going to need a stock harness and ecu to run the transmission.. than piggy back the standalone. Im currently running my ka-t like this.. 139,000 miles ka with bad valve seals, boosting 10lb's tuned on the street by me lol, automatic, mostly ebay parts. Depends what you want to do to your car really...