Hey Vanders, how are you?
I have been thru a Goldy winter without a wettie before but prefer not to now given my slightly "experienced" position. Also, if you head down to Byron at all it seems to be always colder there.
I had used a short john before as with my stuffed shoulders I liked the freedom it gave while paddling.
I have bought a 2mm springsuit last year. It was the same price and with the technology in materiels now it doesn't restrict paddling at all. I would recommend you spend the dollars and get a good one as there really is a big difference in materials they make them out of. I got a Rip Curl Ebomb. Goodtime have always been the cheapest for wetties as they carry last years stock. Mine cost around $200.
I have always found the jacket styles to ride up all the time under the armpits. They are OK when you have that V body shape but some of us are the reverse of that

You could always wear a pair of boardies over a Spring Suit

See you in the water mate.