I was working, sorry guys!
The differance between replacement coils and coilovers:
Replacement coils are just the coil. Obviously. They can be had in spring rates from stock, on up to 700#.
The OME Z140S shocks are not rebuildable, but they are solid and I have seen no reports of them breaking or leaking out.
Most coilvers use 650# springs, are rebuildable and adjustable for height. They can also leak, and need to be recharged with nitrogen periodically. Being as most are made from aluminum, they can be suseptible to road salt damage. They get their lift by useing a stiffer spring and by preloading that spring with an adjustable collar.
I have found that the only real differance between coil over manufactures, is that they all have what they think is the best valveing for the vehicle in which it will be used. Some use a speed sensative dampening, some use a Digressive rate, while most others use a progressive rate dampening. Bilstien uses a progressive rate. Sway-A-way, Fox, Icon, King all use a progressive rate dampening. Most coilovers use an 14" spring for the Tacoma. Leepers uses a 13" spring, and it has a 600# spring rate.
I know Im leaveing alot out. Feel free to ask any questions I may not have answered.