To the Omi-B caravans beyond the 150hp

Moin! Since I plan a change of vehicle in the near future, but I am not sure if it will stay with Opel (at the time 2000 Astra-G Caravan) I wanted to ask here a bit… either n A4/A6 Avant, n Avensis or halt Vectra-C or Omega b Caravn… but then what is strong with the Omega… so either the 2.6 V6 with 180hp or the 3.2V6 with 211 (was or) PS…what do you advise me more…? maintenance? repair? durability? I know about the larger audio motors… which are yes very robust…how is it with the opelz? Did the last Omegas (2001-2003 in about) still have childhood diseases?