I've spent the past few weeks elbow-deep in different planners. I actually go the DIY route with mine, but if you want something more guided, here are a few of my faves:
• Hobonichi Techo Cousin. This one is kind of a cult favorite and I was really, really impressed by it. (There are actually four different models and all are great, but I liked the Cousin the best.) Get one without a cover for $33.64 and get one with a cover for $58+.
• The Simple Elephant. This one has 700+ reviews and a 4.5-star rating, is goal oriented without being aggressive, and has an unfussy and clean design. Get it on Amazon for $19.99.
• Ink + Volt. This planner is super elegant and very goal oriented; it revolves around weekly pages (as opposed to daily ones). Get it for $40.
Whatever system you choose, the most important thing is to actually use it! "It's on my to-do list" isn't just a figure of speech!!!