Thinkpads. If you don't mind used and want something inexpensive and still decent, the T420s/X220s are pretty cheap ($250-400USD depending on configuration) and still very good machines.
Won't break (dropped mine on cement before and came back with just a few scratches and a small dent in the metal) and they're reasonably fast.
Won't break (dropped mine on cement before and came back with just a few scratches and a small dent in the metal) and they're reasonably fast.