This 20A MPPT regulator from Chinese firm Juta is very good value for money. Suitable for 12V systems with nominal 12V panels only, this regulator can handle twice as large a solar array as the 10A version - up to 250W of panels.
An ideal match is with a pair of the XM120 solar panels
Please note that as it is designed only for use with 12V nominal panels, it can't be used with larger solar panels such as those intended primarily for grid-connect systems.