Everything that needs to be said has been said, some great advice re backing.
Just as Squimp has suggested, all my big reels are fitted with 65lb Powerpro or XP Tuffline (Not Suffix as i said on another thread)
You are going fishing for big fish and your tackle has to be spot on and up to the job, and 300 yds of either of the above purchased in the UK is gonna be expensive. However if you need to compromise, you can safely compromise in this department, by taking up Ephemerellas kind offer.... As long as you can get around 300yds of Dacron on your reel, or a little less, you should be fine.
Presuming you will be fishing from skiffs, you are not likely to get any Tarpon run you 300 yds if you play them correctly, for besides the drag, they will probably be pulling the weight of the skiff and all its occupants along too. Any way, in an emergency your guide will set the engine and go chase your fish, so you don't run out of backing......Only ever happened to me twice, but it is good to know you have that option in reserve.
