Welcome Mike.
The first thing that you need to do is lose the concept of "x" inch lift. Means diddly squat unless you have a base reference point to start from. If you have a look through the Ride Heights thread (
here then the first thing you'll notice is that there are no two Tritons exactly the same. To make matters worse, Mitsubishi themselves increased the front ride height a couple of years ago so most of those kits you're looking at would actually result in a decrease in ride height (at the front) if fitted to a new Triton.
Ride height is, of course, the measurement from centre of wheel hub to underside of wheel arch mould.
Let's talk ride heights. Typically the MY08/MY09 VR had a ride height of about 545mm when new. Of course, over 5 years that would have sagged somewhat so you could now be sitting down as far as 525mm.
So, where do you want to be? The general consensus is that around 590mm is the "sweet spot" - maximum height without the risk of CV angles increasing too much and risking breakage. There are some that run n the low 600s with no problem, but they tend to be the minority and maybe they don't push as hard off road or don't have a front locker.
Rears are a similar story with the limit generally dictated by the onset of shudder in those vehicles with a two piece tailshaft above about 640mm (varies widely).
The next urban myth that needs to be dispelled is that height is everything. There are countless stories on here of Tritons just walking through sections that Cruisers, Patrols and Jeeps couldn't. The Triton is remarkably capable even straight out of the box. With a little lift, good tyres and decent driving there isn't much that it can't do. Add a diff lock or two and they become a weapon.
Next, brands. KYB is a well respected brand who make a lot of high performance gear. This is, I think, the first time I've heard them mentioned as a prospective addition to a Triton. Do they (and a lot of other brands) have the experience with the Triton to come up with a really good setup? Do they offer tailoring of spring and shock rates to suit the weight of
your vehicle? How's their warranty and service backup? Do you fancy being the crash test dummy?
When it comes to suspension I'd rather take a route that's tried and proven and it would seem that most of the members here have done the same thing. See
this thread. They're not the only option, Monster Rides are a sponsor here too and many are happy with Dobinsons offering plus some with other major brands.
Your call. Enjoy the research.