I would suggest that you invest at least some of the money in another external hard drive. Taking your comments at face value, you have all your photos and music on an external hard drive. You really do need a back up for them! Such a drive need cost no more than £50. Acer, Dell, HP, Samsung, Sony, Toshiba are all good makes.
there sem to be 15.6" Intel i3 laptops on their website for around £500.