I got my system (non 3-link) for under a grand from Challenger4x4, Farnborough (Hants). It includes 2" lift springs, dis/re-location cones, extended pro-comp shocks drop shock mounts, updated front turrets, cranked trailing arms and longer braided brake hoses. It might not be the prettiest, but works great. I think they are also woking on a 3-link front set-up
I agree with Hybrid-f-h about the questionable usefulness of the springs dropping miles off their mounts - as you tip over the weight will shift more and more onto the "down" side, leaving little weight on the dislocated side resulting in that wheel will give little drive, if any.
I also agree with Mark90, I can't see how having the springs fixed at the top can possibly change the relocation agle, but it could be quieter.
I will be adding castor-corrected radius arms at some point, but couldn't afford it all together.
In summary, you can get the same results much cheaper! If you've got the moey to burn, spend it on the biggest, most expensive tyres you can get
This is the only picture I have of mine showing axle articulation at the mo (not a lot, I know), but it goes way beyond and has, so far, always reseated nicely. (BTW, that's not me in the foreground)