Take a look at this. In all honesty, your nephew may find that a budget machine is going to struggle to keep up with the use that he will give it. A lot depends on what he's going to do at university. A budget laptop will be OK for day-to-day course work, but when it comes to streaming films, games, or image manipulation for instance, it will falter somewhat.
On a tight budget it can sometimes make sense to buy a used machine with a bit more under the bonnet.