Interested in getting a Chromebook because they're far less cheaper than a laptop.. can you expand the memory using an SD card I would mainly be using it to surf the web and play movies using my chrome cast.
Most CBs can accept sd cards. I don't use them that often, so I can't say how well they work for movies. But they are nice machines for just plain surfing. I have the C720, and I love it.
You can use either SD cards or USB flash drives to expand your storage. I recently used a flash drive to play a few movies files, which worked flawlessly.