When we're talking about the 1UZ Vs the 3UZ, it's pertinent to note that the 3UZ offers 10 additional lb-ft of torque over the VVTi 1UZ, but is close to double the price. To my mind, that simply doesn't make sense (other than for the SAKE of those additional 10 lb-ft, of course). The 1UZ gives THE most bang for the buck, out there. Bar none. And believe me when I say this: bar NONE. With the price difference between the Quad Cam 32 Valve 1UZ, and the VVTi 1UZ, having come down to next to nothing, I'd suggest the latter rather than the former.
3 to 5 years from now, I have no doubt that the 3UZ will rule the roost. For now though, the 1UZ is simply incomparable for high speed, high torque, high rev applications.
Best of luck with whatever powerplant is chosen!