I like both honestly. If I lived in the city and had to commute through traffic, I would definitely be eyeing the auto. Fortunately I drive my Z mostly through country roads and the manual is an absolute blast. I'll continue to enjoy it until there's no more out there.
They threw that price on there because they knew someone would pay. You should have walked away or accept you overpaid and be happy with it. No one forced you to buy the car so I don't understand the complaining. You didnt HAVE to pay 10k over, you chose to.
Edit: Having said all that, congrats...
I only looked at the price which seems quite low. Then considering you were asking about info (most reputable brands have lots of info out there), I assumed this was a knock off ebay brand. If it's not, my mistake