No DVD drive would be a deal breaker for me.
A compact PC laptop is purposed as a travel PC. As such it needs to do some basics. #1 is internet connection, ethernet, wifi, and wireless service but w/o an internal wireless a USB 2.0 port will work fine since you can get the dongle adapters for EVDO and 3G.
Next it has to have some entertainment value for personal movie viewing on flights and in hotel rooms.
Finally have earphone jack for private listening.
If money is a big deal, maybe this is the right choice and then buy an outboard USB DVD drive. I just prefer to have everything I need built in even if it cost more. The price for what you do get is really good however.