Hi there,
Another great option is the Toshiba Satellite T135D-S1325WH. It is very light and portable (3.9 lbs). However, it is slightly out of your price range at $599 but it has great specs such as 4 GB RAM and 320 GB of storage. It is definitely one to consider. It also has great battery life so you won't need to constantly charge it on the road!
Cheers,
Isabella
MSFT Windows Outreach Team