You also mentioned about a slow cooker. I have one and I'm thinking about chucking it. It's possible that mine may be faulty but it doesn't really cook anything. The low setting barely warms things up. Even the high doesn't cook everything. If I was to put a hotpot in there I could leave it for hours and the potatoes would still be hard.
I use my pressure cooker a lot. Really I only make soup in it but I make it a lot. I fancy one of those multi cookers. It looks like a plug in pressure cooker but can do anything from rice cooking to casseroles and of course soup.