What other features are you looking for, and what battery current limit do you need?
You should pick a current limit that is enough to do the job you need it to do, but below the limit of the battery pack's capabilities to easily handle.
Features could include but are not limited to
-display (kind? features?)
-programmability (what options?)
-regen (what kind? limits?)
-FOC? (or just sine or even just trap)
etc.
The Grin Phaserunner is good up to 90v max. (21s LiIon)
The Phaserunner was our first major controller partnership with ASI to bring their high performance field-oriented controller platform into a form factor and connector standard that worked well with ebike systems. It can support up to 72V nominal batteries and works well with systems running...
ebikes.ca
There are various VESC variants good for certain HV applications.
Nanjing Fardriver and some others I can't recall the names of are available, too, but require some deciphering of instructions, menus, etc to be able to program them for use.
Kelly makes some, including but not limited to these
E-bike brushless motor controllers output high taking off current, and strictly limit battery current. Motor speed controller can work with relative small battery, but provide good acceleration and hill climbing.
kellycontroller.com
If you're up for some DIY, you can use a Lebowski brain board from Kiwifiat, or the OpenInverter board, to drive the powerstage from any suitable controller (whatever will handle the voltage and current you're after), such as the Honda IMA (see Marcexec's thread or mine on that specific one).
There's also some threads over the years like this
Ok....does anyone know where i can buy a SENSORLESS controller capable of handling 100 volts and 65 amps. I have a Lyen controller that needs repair but I have not heard back from him to confirm a repair service. I have a Crystalyte HS3540. I know Kelly makes a robust controller but only for...
endless-sphere.com
that might still have working links (most, like that one, are pretty old, though).