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Also, I think u may open a can of worms here. This has been done to death and you will get the "4.2 all the way" fanboys start ranting about how every 3ltr blows.... "my mates brothers sisters boyfriend had his 3ltr go bang" Blah blah blah.
As long as you stay away from the 2000 - S2 2002 models, you should be fine.
Also, it went a little like this..... Series 1 GU 2.8ltr (08-99) -> Series 2 ZD30 (2000 - late 2002) -> Series 3 ZD30 (late 2002 - 2004 ????)... Thats all I know. Common rail was introduced in 2007 as mentioned above...