Tech Refresh

At my school, I am the technology contact for our district. We are beginning the process for a technology refresh at our school. In other words every few years we a re given a budget to replace tech at our school, with newer and better machines. While tech refreshes for the last 10 years have all focused on replacing desktop computers in labs, things are starting to change. We are going through a process to try and figure out how we can integrate strategies to get more technology into the building. Currently we have 4 computer labs that are available for teacher use, and about 4 carts of 30 or so chromebooks. The question right now, is if we want to replace some of the lab computers with chromebooks so that we can get more devices into student's hands. While we think this is beneficial, it brings up concerns about what software programs we are using that require a hard drive. We are also mildly concerned about the durability of these personal devices. If any of you have been through a similar process I would love to hear your input. Have you had issues with the durability of devices? Have you found that there is anything you cannot do on a chromebook? Let me know! Thanks.