Hello tonynufc,
There's some very good advice in the replies by the lads already.
My favourites are, Trilene, Tritanium, and for the money you can't get much better than Daiwa Sensor. Once you've tried a few brands you'll end up with your favourites.
What I would say is avoid some of the newer lines that claim to have a very low diameter for the breaking strain, they don't offer the same abrasion resistance as the normal diameter lines.....one little nick and you've lost your gear. There's a very good argument for buying lines by the diameter rather than the breaking strain.
Regards Ian.