166 which engine you recommend

Hello Douch mal Hilfe hier im Alfaforum I would like to buy an Alfa after several BMWs, it should be a 166er, am looking so up to 10,000 Euro, for this there is already a big offer. My question now, which engine is recommended 2.5 or 3.0, what looks like with the reliability of the respective engines, what consumes you so realistic. What should you pay attention to when buying, which stacks the 166er The diesel 2.4 JTD should be quite good, but I think the is worth less for me, because I drive with the private car only about 8-10000 KM Km a year and I also prefer to have a 6 cylinder petroler.