i don't think levers are interchangable between the "coffin" style and gold-line style with the remote reservoirs.
if you get a complete master cylinder with reservoir and lever, you should be able to swap with your coffin directly. you can use the same brake/clutch lines. i'm also pretty sure that the microswitch for the brakelight's the same between types.
if you can't get the brake and clutch m/c's at the same time, i'd suggest getting the brake m/c first, and then follow up with the clutch m/c.
oh yeah... one thing to keep in mind is that if your mirrors mount to the m/c's, you're restricted to using those off a monster. if you're using bar-end mirrors, you can use m/c's off any model ducati.