as an option, i've been seriously impressed with my accossato one...it's too good for my stock front end tbh combined with Hel lines and decent fluid and pads! mike at biker discount store on here will give you a decent price no doubt
Tyke the rcs is a great bit of kit, but as jimbo said the accossato is good too and might work out cheaper but if it variable feature you want accossato do the prs The rcs costs a little more cos you get the brake light micro switch included where as you need a hydraulic one for the accossatos
Listen to the boys tyke i have RCS on the blade accosatto on the orange racer and no difference mate id go accossato every time
Here's the variable one, you could always flog the lines and gain some money back, from the bikerdiscountstore Accossato PRS Mk2 Master Cylinder 19 x 17-18-19 Adjustable Ratio | eBay