Check out the Sequoia section of TundraSolutions. There's some good information. Basically the front suspension is the same as the Tundra so there are many options. The rear is unique but a guy on the TS forum has figured out a OME solution using LC 100 parts. Pretty sweet.
I vote for a 1st Gen Sequoia. I tried very hard to find a 100 series in our price range with reasonable mileage but ended up settling for the Sequoia and I haven't regretted it. It's done surprisingly well off road and it will easily hold 4 kids in comfort.
