Which kit for replacing LIM/Headgasket

The day has come... I need to replace the Lower intake gasket. I've been adviced to do the headgaskets to. Because I live in Europe and parts are really expensive here, i'd like to order them online in the US. But I need to know what I should get. I came up with these sets, but I have no idea if I need something else and which set is the best.

Can you guys help me out here

http://www.1aauto.com/1A/IntakeManifolds/Chevy/Venture/1AEIM00014/334810
http://www.autopartswarehouse.com/search/?Ntt=Cylinder Head Gasket Set

I don't know what year your van is, but mine is a '98 and I used the upgraded ones from GM for the LIM job. If you do not use GM's version, I heard that FELPRO was the brand to use. I do not know what brand those are that your link is pointing to. I cannot comment on the head gaskets.