vee's ***. these levers (well worth buying the pair if you want to use a front cable brake later too...best cable disk brake going....). i found SD7 callipers to be nice at first but prone to alot of wobble when they wear, i have a set of bikehut vee calipers there very well made, not as nice to look at but there far more sturdy than the sd7's i'm using atm. don't skimp on the cable but don't get suckered into buying silly expensive posh ones, just a new inner wire every few months (i usually replace it every 4 months) i think i'm using this cable atm, but linear slick cables are prety mint too. i really rate the tnn lgv pads, they're the best pads i've used so far...
levers - £16
caliper - £16.95
cable - 2.99 / £6.99
pads - £30
that all floats in at under £70, winner