Ok, thanks you every one for your input.

Another thing I was thinking about last night is whether it makes sense to launch the new domain, work on SEO for this site for say a few weeks / months while having the old domain, getbiz, still live and active.

Then when the new site is truly up and running, then implement the 301 redirects from the old domain? I don’t want to shoot myself in the foot by having the old domain suddenly disappear if the new domain will not instantly benefit from the effects of a 301.

I've also written a section on redirects based on your input, at my blog seo for biz. Hopefully other people will find this of use some time.
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Dave