I just gave up my Samsung i600 and went to the 7100g last week. Never looking back.
I have close to the same mail setup as you. The downside of setting up an Outlook rule to forward is that when the mail arrives at the BB, it'll all look like it came from you, not the original sender. I have a mail alias set up so I get personal mail pushed to both places. Works great and reading them on the BB has no effect on the server copies. Can't comment on the redirector.
At work we have an Exchange server that has Outlook Web Access enabled outside the firewall. The blackberry.net account has the ability to use that to get your work e-mail at 15 minute intervals and forward it to the BB. If you have no outside access at all I think the only options are to set up an Exchange server-side forward rule (with the same issue as above) or use the Enterprise Server.
No way to set up the "copy to Outlook Sent-Items" that I know of but that would be cool.
You can play with a virtual 7100g to your heart's content by downloading the free SDK simulator set at http://www.blackberry.com/developers...ls/index.shtml
Unzip it and run 7100g.bat