Buy Omega ? Which ?

I play with the thought of giving my Calibra 16V possibly and to buy an Omega. Actually I had thought of a 2.5 V6 or an MV6. But now I have unfortunately already heard/read often that these models are very problematic. Which problems do they really occur again and again (motor, chassis, electrics …???). I would also take a 16V in doubt, but the probably performance will not tear anything off the plate or see I The wrong thing? I’m on the road at the moment with about 170 hp.If an omi should come into the house it will be converted to LPG/Autogas. I think this should go without problems with all engines or? How reliable are the 16V engines compared to the 6 cylinders? Should an Omega B be with a maximum of 14otkm and before Facelift (I think this looks horrible especially in the interior).What do I have to create for a good one. What does it look like with the B Omis with rust? I know many questions. But when I give off my Cali I want to know that I don’t regret it, because it has put a lot of sweat in it and I am attached to it myself. But it should now be a rational car with space, comfort and little consumption (GAS). Oh yes workshop actually does not exist with me, we do everything ourselves, therefore the costs do not apply (but does not mean that I want to screw more than driving) I hope for many answers which will make my decision much easier for me . Thank you MfG