In reply to J1234:
don't know what the rivers are like down your way, or if there are many active kayakers, but if it's an option i'd recommend joining a club.
That'd allow you to borrow some gear, a boat, a paddle, etc. and see whether you like the sport
As previously mentioned, the boat you like the look of probably isn't the best for someone just starting out, but it depends on what you want to do and are willing to put up with. you might swim alot at the start but once your braces and rolls and things get better the dagger would probably be great
i'd try it in whatever kind of boat you can get your hands on and see what you like then, if you like a particular aspect of kayaking, get a boat designed for that.
Being in a club with pool sessions is also handy for learning strokes and techniques in a safe environment.
I definately wouldn't recommend buying the gear and launching yourself solo down a length of whitewater, best go with experienced folk and they can teach you how to read the river so that you can run it in relative safety, and rescue you when things go wrong.
There are kayaking guidebooks to tell you about the rapids on particular rivers, but these are a bit more like winter route guides than summer rock route guides, in the respect that river conditions change all the time and the guides tell what the rapids are like under 'average' runnable conditions.
>Is it more or less dangerous than climbing?
It depend how hard you push it,