I second the recommendation to get a ThinkPad - and I mean a real ThinkPad, so one of the t, x or w line, not IdeaPad or any other line from Lenovo that just makes use of the ThinkPad name while not providing the expected quality and features.

As you are working with a limited budget I would actually recommend buying a refurbished older ThinkPad model (t410/t510/w510/t420/t520/x220/etc. - but not necessarily the t440/t540 due to the unfortunate thouchpad choice). You will generally get something better & more durable for the same money that will get you a new but crappy notebook.