It's hard to beat Rough Countrys for the price. They give about 2-2 1/2 inches for the 4" kit & are plenty flexy for wheeling. I have the 4" BDS, and got almost over 5" of lift from it. However, it's VERY rough for the first several thousand miles of driving/wheeling, but gives great stability without track/sway bars on the road, and is very tough. Get hold of toyotaguy (Aaron) when he gets back on Sunday, and see what he recommends, or oldyj (Roger).
Farmboy (Dave) put on a RC lift and was running right out of the box, but i've had my BDS for almost a year & a half, and it's just now breaking in & flexing/drooping like it should.