Gotcha, misread that on toytecs site. Besides the 5100's which im pretty set on, you think the fj springs are a good choice? I was looking at the ome springs also as well as the rear toytec flex setup.
Ajusa.com has the best prices I've seen on the 5100s. They also typically have a coupon listed on their homepage.
Coil choice is totally up to you. FJ coils are popular because they ride better than stock, provide a small amount of lift, and are pretty cheap (typically less than $100 a set used (that's what I would pay for them anyway). Coils such as ome are stiffer to support extra weight. I like the omes because I have less body roll with them, but I would like to swap for something less stiff because bumps can be a little rough. Unless you are adding weight such as a bumper, I probably wouldn't recommend ome. I had fj coils prior to the ome coils. I really liked them, they were very smooth, but there was still a little more body roll than I liked.
Something that has caught my eye is the ironman suspension. Their front coils are roughly 20% stiffer than stock coils. Omes are roughly 40% stiffer than stock. The fj coils I think are approx 15% stiffer, haven't found exact specs in these though. The ironman front coils would be perfect imo. There's a good chance I'll be trying these in the future. This is all for the front. I've not looked at the rear numbers. I know the Toytec superflex coils are excellent, approx 10% stiffer than stock.
If I were buying a suspension setup today, excluding coilovers, I'd most likely do 5100s all around, ironman front coils with a Toytec 1" lift spacer for a full 3" lift, and the Toytec rear coils. A lot of folks don't like mixing setups like this, but I think it'd be an excellent combo.
I've not been able to find any reviews here of the ironman suspension on the 4th gen 4runner. A full ironman kit with their shocks and coils could be great, I just haven't seen any feedback on it so can't really recommend it over the more proven options.
You'll quickly notice you can spend as much as you want. A spacer lift is fine for light off road use. Don't feel like you have to have a full setup just to hit light trails. I do recommend doing your research and getting the right setup the first time, many people including myself went the cheap route only to upgrade later, spending more money.
If you're interested in the ironman kit or components, metaltech4x4.com carries them.