Great poll! This super relevant to me because my car is paid off in 5 months as well (6 months actually).
Both cars shown are clearly an upgrade in performance (beautiful choices by the way), but I would keep the Z. As much fun as it would be to have a new car, I am SOOOO looking forward to not having anymore car payments. Think of all the extra cash you'll be bringing in every month! You could do some travelling, house/yard upgrades etc etc. There may be a new Z in the future... you could put some money aside each month to go towards a new vehicle once you've had some time to play with the extra moola. You could pull the trigger anytime once you're clear on a decision.
Four seats definitely have an advantage in carrying capacity, but I LOVE having a 2 seater sports car. It "feels" more driver focused/sportier. If you have a daily driver/winter beater, I'd stick with the Z. I think I love my Z more every year
