Slipper clutches and low maintenance don't go in the same sentence Ian, for the road I wouldn't bother as every time you shut the throttle your slipping the clutch effectively = more wear, so you'll get through plates more often than you currently are.
Plus whichever clutch you get will usually require regreasing at recommended intervals (usually ever 1000 miles) so that's a complete strip of the clutch, clutch plates and centre hub - you'll need a clutch holding tool for that and a torque wrench capable of 180ft/lb.
The cheapest option is to find a 748R clutch (usually someone upgrading them) that uses 3 ramps, no bearings and just uses greased ramps, so more maintenance and in theory not as smooth as a bearing version.
Then the bearing ramp variety, just pick your choice really, the best of the bunch as many will suggest would be Bucci they come in road, road/track and track setups (basically the angle of the ramps = more or less slip) and have 6 posts similar to your current clutch, they also make the Ducati Corse clutches and those are available in 4 and 6 post varieties but you're well into 4 figures for a decent one.
STM come in various guises the original 6 post, the Evo which uses a single spring as has been mentioned above, they also use a 12 and 48 tooth basket, 12 is standard but 48t will require different plates and steels which again are more expensive, the advantage of this is the basket should last longer and it's quieter.
