Looks like you're off to a good start. Given your goals, the one thing I'd add is to get familiar with the Configuration Management tools like Nagios and Puppet

Looks like you're off to a good start. Given your goals, the one thing I'd add is to get familiar with the Configuration Management tools like Nagios and Puppet/Chef. Nagios is a management tool ("Server X is getting slashdotted. Go check it") and you can use puppet or chef for system deployment. A working familiarity with those tools would put you in the top 5% of sysadmins and would also be very useful for being the devops guy at a startup.