I'm using a Lowepro Nova 5. It will easily hold 2 camera bodys, and 4 lens up to 8.5" long. Or one body, and 6 lens. Has pockets everywhere.
I bought mine here.
http://cgi.ebay.com/Lowepro-NOVA-5-A...QQcmdZViewItem
Cant beat $57.99 and free shipping. I recieved it 4 days after ordering it.