I have a steering valve from a fork truck thats open center and 4.5 cubic inch displacement, Two rams from tractor supply witch are 2" boar 1 1/8" chrome rod ( I have rear steer so two rams are needed of course ) and then a log splitter valve to control the rearsteer.
For a pump I run a one ton Chevy P-pump, they deliver the most pressure and flow for a off the shelf pump, I also run the stock can to suround the pump with fluid insteed of a stand alone pump with a seperate Res. This way the fluid is allways inclosed with the pump and it cant starve if you flop on your side.
Cooler, I run a large after market cooler used in dirt racing, I don't know the brand name I bought it used at a swap meet.
Line's, I run all -6 with JIC and Pipe fittings, carry alot of extra fittings and one universal line that should cover end to end.
Ive built Hydro systems when I worked for CAT as a welder, so it was easy for me. A kit might be a better choice for someone without the know how, as everything is all ready doped out.
1993 YJ 4.0 60 Front, Rear steer 60, bolth spooled, 5.38's, 700r/241 39.5 iroks and beating it like it owes me money.