i got asked about leaders last night, so i thought i would give it my 2 cents here. our fishing set up for stripers is actualy very similar to that used for tarpon. we use leader to handle the sharp gill plates, needle sharp barbs, razor edged structure, vampire fanged teeth (blue fish), and as a shock absorber and soft stretch for better hook ups for braid.
most times, when using 30# or heavier main line, i don't use a leader, unless there has/is blue fish acttivity, when i will step up to either 40-50# floro/ co-polamar or 75-125# steel leader.
if using lighter main line from shore or normal boat, i would suggest 2-4' of 30-50# floro, co-polamar or mono leader. try to avoid wire leader, stripers don't like it much and most of them are only 35# at best.
when using braid, i would suggest 3-4' of mono or co-polarmar, this gives good protection form gill plates and some stretch to help with hook ups, especialy using cranks. a common braid set up that has become popular is called a hot shot. the idea here is to use braid for backing, and a lot of it, and 100-200 yrds of mono in front of that, connecting to the lure, most consider this the beat of both worlds, and this is how they fish for even bigger game fish like bill fish. it allows the soft bite for a good hook up and a ton of line in case it desides to go zooming off some where, like the next postal code....
when kayak fishing for stripers i use from 17-25# main line, and only when blue fish are here do i use any leader. this is an exceptionm because it's hard enough to break off striper line from a kayak, even to cut it speedily, and i would rather be safe than drown. i have only lost 3 fish due to this, and it was all due to jagged structure.
one thing to watch for is connecting the main line to the leader with a swivel or snap swivel. it's a bad idea in most cases for stripers because we are fishing at night and i have seen a number of top eye's broken by reeling up to the swivel over and over, eventualy breaking the ceramic incert - a reel pain! some times you can't avoid this danger (like using a planer board, blues, etc.), so try to keep it in mind and don't reel the leader right into the rod, leave about a foot of main line down - this will also help with casting distance.
if you don't have or can't find heavy line, doubling or tripling the line works well to, it just takes more work.