A 1UZ is one of those motors that adds to the "wow" factor. 2JZ's, LS1's, damn B18 Honda motors are slut motors that have been inserted in damn near everything. Building the 1UZ still pops cherry's in the engine building world, yeah it's aftermarket is a little on the slow side but it will pick up. There cheap to get, LS400's or SC400's pop up in pick your part all the time and 90% of the reason there sitting there is due to collisions.
If you want something a little more crazy get your self a 1GZ-FE, 5.0 V12