i was in your situation few months ago, i wanted to buy second car and my choice is either perdana or cefiro a32, in the end i choose cefiro a32 2.5 because cefiro spec is higher than perdana and most of my friend including my mechanics said its more durable than perdana, even Nissan still using the VQ engine for the newest cefiro/teana, so far maintenance is okay for 2.5 V6 engine,smooth ride and good power, i think maintenance shouldn't be expensive if you know a reliable and honest workshop / mechanic.
btw if you decided to go for the cefiro, take the 2.5 engine as it will give enough power and road tax wont be as expensive as the 3.0