Buy Space Rangers 2 and it comes with the first one, although the sequel is the only one worth playing. It's very addictive and hard as fuck when you start out. I love how stuff is happening on every single system all the time. And stuff isn't stuck in one place, either. Everybody is moving around the galaxy, landing on planets, killing other guys or joining armies, scavenging weapons and junk just like you. There's a real sense of progression. The first time I played at the beginning I had a short mission that required leaving my home system then returning with a bounty or something. When I got back a pirate was waiting for me and promptly beat my ass. After a few days of leveling and getting better spaceships, all pirates everywhere bowed to me or ran like bitches.
The Dominator robot aliens are something to be avoided unless you join an army or kick ass solo. Killing them all wins the game. For the most part they can be avoided unless they get cocky and take over vast portions of the galaxy. NPC characters do the fighting for you. Boss Dominators can usually be killed in a few different ways. Either brute force, a virus, somekinda code, or whatever.
Minigames range from pretty good to retarded. The text adventures are cool, unless you get the odd one that makes no sense because of the bad translation. I'm in no way implying the translation from Russian to English is bad. There's only one instance (besides the hilarious intro movie) where I was left stumped. The robot RTS missions are silly and way too easy. All you need to do is build one amazing robot, switch to the third person view and play it like Mechwarrior. I skip the rts minigames entirely. Another minigame reminds me of those bonus stages from Sonic the Hedgehog. I think it's inside a black hole if I remember right.
Other things:
Lots and lots of customization. Many different alien civilizations with their own unique tech. Pirates. Trading. Exploring uninhabited planets. Asteroids effected by suns' gravities. Good music. Easy controls. Fun combat. Pissed off and friendly aliens. Stupid cutscenes. Easy to beat once you don't suck. Randomly generated galaxy for each game.