The Kitchen would be your first priority; for every reason.
BUT, if you can't afford to do it NICE; with new cabinets, granite, and stainless steel appliances; then you shouldn't do it!
Doing a cheap job will show, and it will be a bigger negative.
If the paint is good, inside and out, (Light, warm colors, not white) then just concentrate on staging the house:
Take out all personal items and half the furniture; nothing you don't need on a daily basis.
Make sure everything is clean and smells good.
Have your Realtor give you his seal of approval.