I recon i depends what your gonna use your 4x4 for! If your going to use it, like so many do, on tarmac school running or just for show you dont need to get anything massively capable hence the fronty would do the job, but bits tend to fall of them.
but if you want to buy a 4x4 for the reason they were designed well i would say go for a Jeep. You can pick up a good Mk1/2 Cherokee for peanuts, and most of the 4ltre straight 6 models are already fittted with LPG. The Cherokee,s have front coils and rear springs but are far more capable then a disco. The grand Cherokee,s have all round springs and are even more capable off road. The downside of the grands are the fact that they are fitted with the Dana35 rear diff which tends to break on severe assents! Unless the super35 diff kit is fitted. I busted 3 dana35 diffs in 4 months, but that was extreme terain off roading.
But like I said, if its a 4x4 for show, you can pretty much get what you want! But if its a 4x4 for real use, get a Jeep mate, there cheap as chips

And if your thinking of moving to the Hereford area I have a good friend over there who builds, upgrades, and does off road prep on most models of Jeeps!

Here are a few pics of my old monster!



