I think it's just a topic that's been done to death.
The best quality springs tend to be land rover ones and is you search there is a spring list on a web site that's referenced from here a lot.
It gives the spring length and poundage - so you can look what you have now and look for further options with a higher spring rate.
Also referenced from this site a lot is an online spring calculator - so if you weigh your truck front and rear, deducting the un-spring weight (which you can estimate by searching on here), you can then work out what the change in ride heigh will be from fitting those springs.
Shocks wise - everyone has an opinion but it's pretty much as said above. I have OME and they are excellent.
The built in site search is quite poor but if you put into google::
Site:lr4x4.com hd spring list
Or the like you'll find lots and lots of opinions given before