As mentioned by Lunatic, java moss, java fern, anubias, cabomba, anacharis, sword plants are ones that come to mind. For me, crypts will grow once I get them established, but establishing them is where I have a problem. Carpeting plants need a little work, but I've had pygmy chain swords grow with very little work.
As far as leaving them for a week, one of my experimental planted tank has a DIY CO2 setup and I fertilize using the PPS Pro method (fertilize every day) and I'm able to take a week+ vacation and not really have much of an impact on the tank. At minimum, you should have a light timer and the plants will be fine. Root feeders will only really need fertilizer maintenance once a month or so.
I wouldn't be afraid of trying plants.