Dont worry i know the feeling, ive only ever owned a rotary and i was so sad to rid mine, the pair of them, as for the mx5 dont knock it..... i got a few friends that can absolutely drive the socks off the mx's and get them sideways everywhere literally great cars, especially when there supercharged, power to weight and they move like rockets lol.
On another note you will love the Z and eat that m series for tea, when it arrives haha goog luck searching