I like sins of a solar empire less than galactic empires.. I quit it after a few started games.
PS you get less ganged-up upon if you actually start completing a few missions for otehr races. It helps a great deal if 3 races want you to target another race.. DO IT or basicly you'll die from all 4 races 

 and try to stay neutral (relatively, or just defendeing a bit) untill you get such a target.. all my (al be it few) games I saw this happen... usually once you are halfway through destroying that nation they will want you to target another though.. which probably doesn't fit in your plans then.. but hey.. you are way positive in their favor then .
MoM was great.. I've played it a few times on dosbox in the last years but really... it's way to easy.. the idea is great.. 2 worlds 
Myth was nice too I'll admit
populous was nice even the latest version
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				Want a blend of 
fantasy and 
sci-fi? Try the total conversion 
 Dominions 3000  mod  with a new and fully modded solar system map.
Dragons wanted? Try the 
Dragons, Magic Incarnate nation.
New and different undead nation? Try 
Souls of Shiar. Including new powerfull holy magic.
In for a whole new sort of game? Then try my scenario map 
 Gang Wars.