After being reminded by the space geeking cast and not finding it in a search thought I would put on here this rather fun and promising game.
http://kerbalspaceprogram.com/
It is still in ongoing development but even with what it has so far is pretty good with some nice EVA just added. I belive it is $18 now with an increase as it develops so cheaper earlier and there is also a free demo with limited functions (trying to land on the Mun without landing legs is a pain).