Which key type for offline signing key + how to get a trusted copy of gpg signing key

[Jakob]

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Hello,
I want to create a key only used for key signing (on an offline system 
with Knoppix). As I recently read that 1024bit DSA-keys are quite small 
for long time security (let's say 10 years) I wondered whether I should 
use a 4048bit RSA-key instead. Is there any reason not to do so?
The Knoppix version I use only comes with GPG 1.2.4 or similar. I would 
like to upgrade to GPG 1.4, but have no idea how to get a verified copy 
of the GPG signing key (57548DCD). How did you verify your first copy of 
this key?
Sorry for my english, and thanks for any replies.
Jakob Breier.
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2005-02-23
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