A topic that seems to be pretty highly debated is whether that (a dynamic home page) is going to affect search engines more than your meta refresh. I've been listening for years and most opt for the static home page because they KNOW it works, but no one has presented any evidence that a dynamic page positively kills your ranking. I'm still listening. :-)
I agree, no need for the meta redirects. I would go about it much the same way and would even take it a step further and go to extenionless uris [w3.org].