I love Strongbow Sirrus. You can't get it many places here in Sheffield, sadly.
It's my new favourite tipple, and i only drink cider or alcopops.
As said, you really need to drink it over ice, but i far prefer it to Magners (which you drink the same way).
As for other ciders, i like sweet ciders more than dry. Woodpecker is best (after Sirrus), then Red C, then regular Strongbow - which is very sweet for a dry cider. Very refreshing too when you haven't drank it in a while.
I can't stand most other ciders i've drank. I can just about tollerate Scrumpy Jack, but Dry Blackthorn is the most hideous thing i've ever tasted.