G'day Discotec,
A locking centre diff is a definite bonus if you are intending to use your discovery off road. In fast personally think it's essential.
The early DII( (99, 2000 and some 2001) had the mechanism in the transfer case but not way of activating the lock from inside the vehicle. Some boffin in L/R decided Traction control alone would do!! With ethe introduction of teh 2A in late 2002 they brought factory diff locks back.
Do a search for CDL and you will find heaps of info.
Like this: http://www.aulro.com/afvb/good-oil/39956-cdl-d2s.html
If you have an early DII...with CDL in the transfer case there are a variety of after market options to activate it.
As far as other options, it probably depends how you intend to use it. many swear by ACE ( active cornering enhancement) others hate it. some love SLS some hate it... really comes down to how you intend to use the vehicle.
Cheers. Mark


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