Choosing a Beneficiary

Hiya folks,
I've just got my place in the Great North Run. I managed to get in through the general ballot which is good as it allows me to keep my choices open as to whom to raise money for.
Now, my question is, how the hell do you choose who to raise money for!!?
I know I want to raise money for a charity/organisation related to conservation but there are so flipping many! Lots of different types and lots of different organisations doing the same/similar things! How do you gauge what is more worthy a cause!? And how do you gauge a charity's reputation, or how much of an impact they're making!?
I thought the forum would be a great place to ask, esp since there are folk like Libby who probably know a lot about this kinda thing. Look forward to hearing from you all.
...J...
I've just got my place in the Great North Run. I managed to get in through the general ballot which is good as it allows me to keep my choices open as to whom to raise money for.
Now, my question is, how the hell do you choose who to raise money for!!?
I know I want to raise money for a charity/organisation related to conservation but there are so flipping many! Lots of different types and lots of different organisations doing the same/similar things! How do you gauge what is more worthy a cause!? And how do you gauge a charity's reputation, or how much of an impact they're making!?
I thought the forum would be a great place to ask, esp since there are folk like Libby who probably know a lot about this kinda thing. Look forward to hearing from you all.
...J...