Attaching everything to my email address would be great if I could just change my primary gmail username. I'm a bit fed up of it now. I have secondary accounts

Attaching everything to my email address would be great if I could just change my primary gmail username. I'm a bit fed up of it now. I have secondary accounts (which are painful enough to manage in the light of Buzz etc), but I don't want to lose access to 7 years of email and contacts either. The only solution I can think of is setting up a new address and a forwarder...