I've wanted to buy one for a while (still do) I consulted a Independent LR mechanic and he suggested the 98 disco because it's still a series 1 and more aftermarket parts are available. As far as repair costs I wouldn't know. Also check out
http://www.rovertym.com/ if you haven't already
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RIP....04 KJ Sport
2006 Jeep Commander, 4.7L (stock for now)
Homemade Roof Rack or Thule Atlantis 2100
Comming Soon: 2.25RR", 265/70R17 Goodyear Duratracs, wheel spacers, 6000k HID's.
http://www.cardomain.com/ride/3314060