Finding your perfect planner doesn't have to be expensive. In fact, if you have a printer you can try out lots of free printables and set yourself up for the year at relatively minimal cost (depending on how expensive your printer ink is!).
The Philofaxy free printable planners come in a huge range of formats and sizes. They are designed to be used for ring binders (Filofax etc.).
Homemakers Daily also has some free printable pages for Filofax and Franklin Covey binders, in daily and weekly formats. Also at the bottom of this post she has a download for my favorite weekly planner format.
Productive Flourishing planners are different from usual planners in that they are designed for people who work to projects/ tasks rather than to a time schedule. Each month they make their planners selection available for free downloading, or you can buy the whole year if you don't want to wait for them to come out each month.
Passion Planner has free downloads of their weekly planner, or you can buy their bound version. Heads-up: the free printable has Monday starting weeks but their 2015 bound planner to purchase has Sunday-starting weeks. I have to admit I printed out some of these free pages and have been playing with them this week.
Here are a bunch I haven't tried myself but look good:
The Handmade Home
DIY Planner templates
CrazyLittleProjects not only has great-looking printables but also some stellar planning advice.
Scroll down this post from GlueSticksBlog to see links to all the various pages she used to create her free printable planner.
She used the monthly calendars from Miss Tina (2015 version in the link).
Scattered Squirrel has a great variety of undated printables.
What are your favorite free printable planners?