Hey this one is for you Dingo,
I got the X3 Terran Conflict installed and went researching mods last night.
I found there is one great big mega-mod which you can use, however also no other mods can be used with that except a select few but this is all we need I think.
So this is what I installed and the order I installed them after the v3.0 patch:
1. X-Tended - Terran Conflict (Mega Mod): http://forum.egosoft.com/viewtopic.php?t=293490
2. Takeover Script - Allows overtake of hostile sectors: http://forum.egosoft.com/viewtopic.php?t=243791
3. PCSO1's Cockpit Mod (Adds Immersion!): http://forum.egosoft.com/viewtopic.php?t=254635&postdays=0&postorder=asc&start=0
For the cockpit mod - to work with X-Tended (XTC) choose the fourth download link only called "XTented v1.0 version (merged 1.03)" - direct DL link is: http://www.mediafire.com/?s57az9x7waqnu1h
Note that you probably need to start a new game to get the full benefits but have a look at the XTC manual to see more details, after installation the XTC manual is in X3 Terran Conflict\XTC Manual folder. It's 30MB, so too big to upload here.
I haven't tried other cockpit mods, this is the only one that I'm SURE will work with the XTC mega mod. There may be nicer ones out there but it's alot of reading to see how complete and compatible they are but for now this one gives me a cockpit feel and works well. This is an example shot: