In reply to Father Noel Furlong:
If you got for a triple rated, on many UK crags you can use one doubled up as double ropes, or just single for more straight forward routes - just make sure you have a belay device suitable for a 9mm single rope. Of the three I reviewed here
http://www.ukclimbing.com/gear/review.php?id=3765 I literally just last week had to cut the Serenity in half after the sheath got damaged. A few metres had come of each end too, but otherwise it had been superb being used A LOT for over 5 years. It has been my go to rope for a lot of climbing over that time. Of the other the Swift is still going strong, and is currently in the Alps with a friend's daughter - long story, but anyway the rope is still good although hasn't been used as much as the Serenity. The Joker is also in decent shape and I've used it a fair amount as a winter rope, again hasn't been used as much as the Serenity, but probably will now that I have two 25 mtr bits of Serenity!
Basically 9mm triple-rated make great all-rounders if you're not falling off or top roping a lot.