I might find a demo of Distant Worlds, I've heard lots of good things about it. I need more grand strategy games in my life.
On Stardrive: It's a decent game, but not for the price. I was in the early access rush, and feel like the amount of progress between then and now is minimal, with patch notes reflecting the "I don't really feel like working on this" aspect of the creators continued development, only containing minor updates and bug fixes, with very little content. It's a "complete" game, but if you're looking for depth, then look elsewhere, as it doesn't appear that new features are being added any time soon. I'm cautiously optimistic that it might be a bit more fun to play in the future, but once you've got the small tech tree researched and half the galaxy conquered over the buggy AI, I lose interest.
It is hilarious to make a Titan sized cargo hauler, and watch as the inertial dampners cause it to miss its jump, where upon it will jump back and forth missing the planet it is trying to resupply each time.
Edit: There are some mods made by users that expand a LOT on lacking content in Stardrive. One such mod that should work with the current version:
http://stardrivegame.com/forum/viewtopic.php?f=6&t=7091636 New Modules. Mk2 - Mk6 versions of almost all the vanilla modules in the game plus custom modules, they get significantly more powerful with each level. Gain the upper hand with tech, and blow your enemies away. Fall behind and suffer the consequences.
175 New technologies to research and discover.
1235 New ship designs for you and the AI to clobber each other with.
357 redesigned vanilla ships to bring them more in line with the mod and provide a greater challenge. Some are slight changes, others have been completely redone. I tried to keep Zero's original weapon styles in most cases. (New in V1.03)
I'll have to look into this once I get home from work.
Sword of the Stars was kinda hard for me to get into... I'll need to revisit it at some point, because I lost interest before getting too far into the game. Which is strange, considering how much of a learning curve Dwarf Fortress has, and how much enjoyment I get out of that. It was probably because I started as the insectoid race, who don't have hyperdrives but do have warp gates once you get to a system, making early game a slow crawl.
A game in the same vein is Star Ruler, which I can't recommend the Galactic Armory mod enough for. Star Ruler 2 is in development, but Galactic Armory is a fairly stable (if resource intensive) mod that expands upon the base game by a huge amount, adding things like sustainable mining vessels, helium-3 refining, terraforming at high tech levels, new module and hull types, new customizable race options, and a bit nastier AI at the higher difficulty levels. I say resource intensive due to the fact that asteroids are modeled individually (and will orbit around a star system, if applicable, in the hundreds), and computer players tend to build huge swarms of some of their better ships once they get going, and are extremely efficient at using orbital factories for metals, electronics, and other resources.