Without audio part (Control Surface pure):
* mentioned Mackie Control (MCU Pro) and XT.
The functionality is the same as on original (old) Mackie/Logic units.
Limintations: no soft synth control, no Pro Channel control (with mod PC EQ and Comp supported)
* Mackie clone Behringer X-Touch (big one). The functionality is the same as with the original, but hardware components are not the same and there is no XT clone.
- other Mackie clones (QCon Pro, FaderPort 8) are NOT recommended (only partially compatible with original unit)
With audio part.
Before considering, check that you really want standalone unit and that number of analog inputs/outputs. Otherwise consider Control Surface plus separate audio interface/rack mixer. F.e. MCU Pro + RME UFX, X-Touch + X-Air.
* Behringer X32. More or less X-Touch with digital mixer in one body (up to now it is not possible to use all faders to control Sonar)
* A&H Q (16/24/32). Sonar control is basic, but all faders can be used (in fact that is the only functionality of this device with Sonar, plus several buttons).
- many other mixers (Yamaha, Tascam) can somehow work as Surfaces for Sonar, but there is no information how good.