TC is totally top of the line for IFS, with the caddy kit (gen 1 i believe) my buddys 3rd gen pulled about 13" of clean travel in the front. He hammered that poor truck we jumped it way big at speeds quite a few times to this day its still holding up and runnin strong. He wasnt runnin 4wd witht the T-100 axles but the travel would be slightly less if he was like around 12" I think. I would say that with the kit and coilovers shock hoops and bumps you would be in around 4-5k. From what I have read though guys that keep the 4wd love it and say it wheels nice in the rocks and trails, and they can bomb in the desert too.
X2. I have a friend that had this kit on his baja truck and it was a sick kit. We blasted through the whoops and jumped it going 50 mph + and it felt like we were mall crawling it was so smooth. He never used it for crawling because he only had 2WD but it was the smoothest toyota I had ever ridden in at high speeds over washboard roads, dunes and whoops. You are looking at 4-5K with the fenders and t100 axles and other necessary items. If you think you are going to do a lot of heavy abuse, high speed driving this kit is for you. It also works great for 4 wheeling as it offers plenty of wheel travel. It is meant for fast, hard abuse though.