u/Feisty_Collar7700

I'm looking for a kayak to do some expeditions, mostly 4-7 night trips, looking around at pre owned models and have come across a seabird HDPE-sandwich and a Q Kayaks Penguin. Wondering if these models would be any good for what I'm looking to do, if not other reccomendations welcome. I'm located in Australia, with a lot of sit on kayak Paddle experience and a bit of sit in experience. My budget is around $1800, looking for something preowned to gain a bit more experience.