My monitor has been calibrated using a Spyder 3 pro system as well.
Here are my settings under color settings:

Now, when I'm 'soft proofing', under View -> Proof Setup -> Custom, I believe I'm supposed to be selecting the paper/printer that I will be printing to, then selecting the Rendering Intent based on what would be most suitable for the image:
This is then what the document shows me at the top in terms of profiling information:
I would then (theoretically) go through my adjustments to the image and print through Print with Preview. Here are my settings:

Then, finally, I would have my printer setup like this:

and:

I realize this is a tedious 'guess and check' way to ask a question, but I was hoping to get confirmation before blowing through some ink and A3 paper... hopefully I've outlined it well enough to get some feedback.
As a side question, I was wondering when I would ever want to use the profile created for my monitor for printing. The Spyder 3 created a monitor profile which I can select under the 'Device to Simulate' box in the View -> Proof Setup -> Custom... menu. Will I ever use this profile when I want to print? I find this possibly the most confusing part...
Thanks for any help you can provide.
