Hi,
I was in similar position at some point.
Few questions to answer.
Are you fussy about the vehicle age? Yes Then go to Gen 2, if not proceed to Gen 1 face lift 3.0(5 speed gearbox) unless doing short runs then 2,4 gen 1 any year you like.
If you get Gen 2 go for 3.5 (6 sp auto gearbox)unless you really use van on short distance in the city.
2.4 gen 2 has CVT gearbox which is something that some people complain about.
Best advice is to go for the nearest dealer and have a drive in each to compare.
Cheers
Lukasz