okr on 22 September 2008
Evochron Renegades (2007) and Arvoch Conflict (2006) from developer SW3DG
Escape Velocity Nova (2002-2006)
are the most recent ones I can think of besides the ones you mentioned. I haven't played any of them, so I can't give you any personal impressions. Here's a list of space sims (incl. strategy games).
My favorite game from this genre is Wing Commander: Privateer from 1993. There's a free remake available, called Wing Commander Privateer Gemini Gold. It's based on the OpenSource space sim Vega Strike.
