I just really like these leather binders. I have a personal size binder which allows you to use other paper rather than Filofax if you want to. Downside of filofax is that local stores are hard to find but online sales are easy. Also, some models can be pricey so look for sales or used planners.
You also may want to consider Staples Arc. It is the Levenger circa knock off and gives you a nice affordable and versatile binder.