I am selling my E4200 to upgrade to either an E6220 or E6320. I only use this laptop for travel and battery life is the foremost concern. I would get either with the biggest main battery and probably a battery slice. I don't care about an optical drive and I will replace whatever hard drive that comes with the machine with a 128gb SSD. Curious how much battery I would expect from an E6220 with larger main + slice compared to an E6330 with larger main + media bay battery. I guess with the E6330 I can get a slice as well and go 3 batteries. I know there are other laptop brands out there....but I'm a Dell guy.