I use Elf Racing, working well so far.

High performance racing brake fluid
ELF HTX 115 / XT 3167
Exceeds the equilibrium dry and wet reflux boiling points of U.S. FMVS standard Nr. 116 DOT5.1
High protection against vapor lock phenomenon.
Excellent corrosion protection and rubber seal compatibility.
Boiling Point °C 260
Equilibrium reflux boiling point °C290
Vapor lock protection °C250
Vapor lock protection with 3.5% water 200
Wet equilibrium reflux boiling point °C 190 – 200
Auto ignition temperature °C> 300

Density at 20°C kg/m³ 1065
100°C visvosity mm²/s 1.5 min
-40°C viscosity cSt 1500 max
Miscible with all DOT fluids. Not miscible with silicone or silicate esters fluids.
Seals to be used: any classical brake system seals (respect FMVS Nr. 116 U.S. limits for seals).
Corrosion and compatibility: no specific limitation (exceed all DOT4 stand Nr. 116 specifications).
Safety and transport information: classified as not dangerous fluid.

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365hp and 515nm

New Beast to arrive April 2015 - 365hp, 450nm, 0-100 in 4.4sec. AMG Goodness!