Look here for inspiration: http://www.tenkarabum.com/tenkara-rods.html Depending on how you want to fish it can be worth getting a more special purpose rod. My preference is for the minimalist no cork grip rods (to each his own.)
My general purpose rod is the Suikei 39 (soft). It zooms from 10'5" to almost 13'. I've landed multiple 20" bass on 6x tippet with that rod (on a size 18 gnat) It's stiff enough to fish weighted nymphs, supple enough to make casting a dry pretty fun. I fish it fully extended much of the time. 13' is more manageable than you might think.
My first rod was the Kitoyaki 27. It's 9'9". For mountain brookies it's a great choice. For waters wear you need a bit more reach to be stealthy it is a poor choice. Also longer -> stronger with Tenkara rods. The length absorbs, distributes the load.
My most recent purchase was the Nissin SP450. It's 14'9", and weighs less than 2 ounces. It casts a dry fly with such grace you start to think you might know what you are doing. The reach is great. I've even fished a rather wooded trout stream with it. The length gives leverage too... handled a 14" rainbow with little drama, despite bending almost in half.