I like very much classics space shoot em ups since i was a child and i had an amiga 500.
Recently i liked very much soldner x especially soldner x 2 because it's easier than the first, better balanced.
Anyway i'm looking for some good space shooters with modern graphics and a balanced difficulty level.
For example sine mora it's beautifull but frustrating.
Can anyone suggest some good space shooters?
Are you talking about Space Combat?
if so then i'd recommend
The Wing Commander Series (on GoG) (may require joystick)
X Wing/Tie Fighter series (on GoG) (requires joystick)
The Descent Trilogy (On GoG and Steam)
Freelancer 2 (On Steam and GoG)
Strike Suit Zero (Steam/GoG)
If you're talking about FPS games in space then
Aliens Vs Predator 2000
System Shock 2
Natural Selection 2
Mass Effect 3 multiplayer
Hawken (highly recommended, especially since it was bought by new devs and being worked on again)
Shattered Horizon (it's dead unfortunately, but if other people on the forums own it, I'd love to play it, it has 0G combat)