Basically…stay away from anything with an “Intel Graphics” whatever they are calling it this month.
Any multicore/decent RAM (read more than 4GB) modern machine with 64 bit Windows should be fine. Discreet graphics (read actual video card) is better…but much more, in the cost department. A midrange i5 or AMD quad will be fine. AMD or Nvidia graphics and at least 6 GB RAM (8 or more is better). Although, giving a quick look…there are some discreet video i5s in the $600 range. (there are some 15” i3s in the $400 range) Stay away from ‘low end’ Celeron/Pentium CPUs…the i-series Intel and A series AMD and ‘up’ are what to look for.
Of course, the larger the screen the easier/better it will be.
Two or more USB ports is a major plus. Grabbing a mouse/wireless mouse…very good idea. Doing this kind of work with the touchpad…frustrating.