Buy a caliper rebuild kit too for your leaky master. Cheaper than replacing it if that's all that's wrong with it (No damage from an accident). Levers are cheap if OEM style or you can get OEM levers cheap - used where people have upgraded their's.
Euro RC51 SP2: HRC WSB Ti Hi-Level, T1 Airbox & Snorkel, PCIII, Dymag CA5 Carbon Wheels, Ti64 Spindles (F, R & Swing Arm), Mori Link, Maxton GP7 Shock & Ohlins 832 Forks, Brembo GP Calipers & SBK narrow track (F), Braketech Disc (R), Brembo billet Underslung x 2 Brembo RCS, Tyga Triple, 7075 Stem, Probolt Titanium all over, Babyface rearsets, MR Complete Carbon Lineup, Custom Undertail & CBR 1000 LED, Watsen LED Indicators, Harris Brace, Giles clip-ons, Corbin seat, etc. 2013 BOTY.
Cheers Jondog, had a look at those before and it was my backup plan, was wanting to give someone a chance to offload a spare if they had one but it looks like ill just buy new.
Stig, thanks for the advice, it's not leaked since I wiped it up so I'm wondering if it leaked because the rotor was badly bent and forced the calipers open. The leak was at the master cylinder, it's a round aftermarket one where the reservoir is sat high up, it was leaking at the bottom of the tube going into the brake leaver... It probably needs a rebuild anyway so that might be the best route.