there should only be jazz2 , the expansion packs were just a new chareter (what sucks) and new levels , the jcs 1.24 is better , but its more about fun gameplay. So I think no choice on the jazz expansions.

I found jazz 1 more harder.

jazz 3d wasn't completed and a alpha can no way beat jazz 2 or 1.

jazz advantage was great but not as good as 2 , dispite it ruining jazz's image.

EDIT:il just go with jazz2 , (not because online play because that can always change.