Definetly the 5 series. I'm not a huge luxury advocate, or the E would be my choice. The 5 has it all...style, power, finesse, responsiveness, the nameplate, some luxury. And a new one is due out soon, imagine that. I'll take my 540i with the Sport Package please.
Nissan cannot take on the Germans with a rebadged 4 year old Jap sedan...no way. They have to design something from the ground up to do it. This car is an Infiniti Q45 in lamb's clothing.