I got EFS leafs, a set of KYB "scorched 4's" (which won't outdo top shelf ones, but are still very under rated IMO) and new bushings for something around $850 all up. All seems to match quite well. I can be a tight arse though lol. Been all through the tracks in the centre, Simpson, Flinders, high country and so on and many highway miles in between quite happily.
A lot depends on the type of driving you are doing. Touring on the highway a basic (ie. cheaper) upgrade for more comfort might be ok. But on rough corrugated outback roads/tracks good suspension is very important not only for comfort, but reliability becomes important. Especially loaded up. For low speed off road stuff it makes no real difference (although a lift helps).
I remember a few years back a group of (rather expensive) Mercedes wagons set out on a promo trip along the Canning. Of course they were halted after a day or two while they got shockies flown in and someone picked them up, because the corrugations literally destroyed the factory ones. So much for that.
Shortly after this, someone took a factory Hilux on the same trip and as they had a huge fuel tank sitting in the back with enough fuel for the whole trip for it and the support car, asked Toyota for a spare set of shocks to be on the safe side. They refused of course, saying they wouldn't need any. They were right, the heavily loaded Hilux did it the whole trip without a whimper lol.
As to what is best, generally people aren't going to spend a lot of money on a suspension upgrade and tell you it's crap lol. Although there are occasional dissenting voices from people who were unhappy with "brand x" while others proclaim it the best thing since sliced bread. Talking to someone who specialises in suspension to match the shockies/springs might be worthwhile, but this has the risk of them promoting what is best for them (either more convenient or profitable). So I'd use a pinch of salt with what anyone (including me) tells you.
Most name brands will probably be alright, as they have a name to uphold. But this also usually means a sales and or advertising budget to pay for and within that range IMO higher prices (with some exceptions) doesn't necessarily equate to a better product.