The ships are indeed, much better quality visually than the units in Civ 4. But, this game makes heavy use of 2D sprites in the background still (unless I'm mistaken), so, the star fields and things like that can't really be compared to the ground textures of Civ 4, at least in my opinion. I could be thinking of the first Gal Civ though, but I thought this game still used 2D sprites in certain areas. Just about everything else is very nicely detailed 3D though, which is a BIG improvement over what we used to have to stare at for hours on end.
And also, just to stick with the thread's topic, I have had no problems with lighting either. I was actually surprised at how complex the lighting could get, especially when compared to the first Gal Civ. I have the resolution at 1280x1024, and AA (anit-aliasing) at 6x, the highest available in this game (at least for me it is). It almost hurts my eyes though, so many pixels.

Also the fact that there is a lot of reading in this game, especially the first time around with it, can put a major strain on your eyes at the resolution I'm at. (Might have to turn that down a bit, don't want my eyes to start bleeding.

)
Sorry Heavensblade23, that the lighting isn't to your satisfaction. Hopefully something in the settings may jump out at you that could resolve your issue. Or, if all else fails, maybe you'll just get used to it.
Edit: Oh, I'm sorry, I didn't even notice you asked a question, I thought you were just asking about the lighting. My bad. If you want your graphics to look top-notch, then just turn up AA (anti-aliasing) to max, and turn up your resolution to whatever is still confortable for your eyes.

I'm almost certain that your computer can EASILY handle this game cranked to the maximum settings--mine can, and mine isn't nearly as good as yours, at least in terms of processor and graphics card.
Just in case anyone is curious about my computer's specs, here they are:
Pentium 4, 3.2 GHZ
1 GB RAM
Sound Blaster Live! 24-bit
ATI Radeon X800XL 256mb PCI-Express
Good, but not as good as Heavenblade's rig.