Authenticode, choice of CA, pricing?

[jdlwright]

Hi, I was looking into getting an Authenticode certificate for the
first time, so that we can sign our assemblies and installers etc. I
looked at a few and saw a wide range of prices;
Comodo, $179 http://www.instantssl.com/code-signing/

Thwate (via a referrer link) $199
https://www.t-refer.com/core/process...ode=CAINDIGO-1

Thwate (without a referrer link) $299 (!!whats that all about?)
https://www.thawte.com/ssl-digital-c...dTo-SecureCode

Verisign $499 http://www.verisign.com/
Assuming equal customer service and time taken to issue a certificate,
what differences should I be looking for?

I'm assuming I could buy any of the above and use it to sign a .NET
exe or MSI installer so that Vista users wouldn't be told that we're
an unknown source.

Any experiences or advice please.

Thanks
Jim

[jdlwright]

Just a note, I notice that Thwate renewals are $159, so they could in
theory end up cheaper than Comodo (assuming pricing doesnt change!).