I need to know what the more robust line of business laptops are from Lenovo and Dell. My oldest daughter, who is now living on her own, needs a new one, and normally I would just steer her towards the cheapest consumer level laptop, typically in the mid $300 range (her current one is an Asus which as I recall cost around $359 a few years ago). However, I think she needs one a bit more sturdy, and I'd like to help her get one that will last a long time, too. Can anyone help me with the model lines in Dell and Lenovo that are at least one notch above the cheapest consumer laptops? Thanks.