Thanks, David. I've made my choice and will order the thing you mentioned first. I'd rather work with 2 computers on one (big) screen and one keyboard and the wacom, than 3 computers with only the wacom. Won't cost much, so I can always do something else later.
My i7 (just for rendering up till now) is now linked to a very small 15" spare screen, so looking at the list of objects isn't even possible, as it changes to a very narrow slit, once the specs are on the left down corner.