So you've got a choice between duplicate content (www.example.com and example.com) and a multiple-link chain?
If someone had a few spare domains lying around, that could be a darn useful experiment. But not if it's anyone's livelihood at stake.
Does the original 302 redirect keep the existing www configuration (with or without) or does it all go to the same format? It's less disastrous if any one request goes
EITHER (old name, any format)
(www.)?example.org >> 302 >> www.example.com
OR (new name, wrong format)
example.com >> 301 >> www.example.com
If all the 302 redirects point to the same form of the domain name, you'll have to stick with that form even if you don't like it.