'03 Disco SE
Join Date: Aug 2011
Location: Clearwater, FL, USA
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The "best" kit, based on quality, warranty, and positive reviews, is likely the OME Medium Duty kit at a cost of $840+shipping. Keep in mind that you'll also want to purchase an upgraded steering damper for $90+shipping.
A more economical kit (which I used) is the Terrafirma medium duty kit at a cost of ~$550+shipping. The steering damper for this kit is $55+shipping. The quality of the kit is great, it provides a great compromise between off-road capability and on-road manners. I've put mine through it's paces and it has yet to let me down.
Provided that you have decent mechanical knowledge, a good set of hand tools, and a jack/jackstands capable of lifting the truck high enough, the install is a breeze. There's a pretty good how-to on Youtube. Having the job done at a shop should run between $600-$800.