All these things that I have done

I'm procrastinating from my tasks (well not quite, actually, I'm running *slooow* tests on the test server) by looking at Getting Things Done web apps again. I'm currently using Remember The Milk for my task lists, which is pretty good, except for one annoying thing. When I complete a next action for a project, I have to then go back and choose another next action. What I want is to be able to order my tasks and have the next one automatically marked as my next action and to view a list which contains my next actions and nothing else. Oddly enough though, it doesn't seem to be what any other GTDers want - I haven't managed to find a single app with both these features so far :( In fact only one has the auto-next-action thing and I found the display of actions there so weird that I couldn't settle to it. I have a horrible suspicion that I'm going to have to write one of my own. Sadly, I'd also like one which was fairly nice looking/easy on the eye and, well, my design skillz per se are not up to much, although I can probably put together something reasonable in neutral colours.