Try deleting Local Content, if you legit aren't here to help the Devs stop using Beta, or stop posting on the forums, minidumps happen in every game, throughout the whole game history, no game is 100% bug free. Seriously if you havent, then delete the game and reinstall, its possible the download didn't work properly.
Sins is a game series that has been very reliable and stable for me, and all the people I personally know who play it.
Stop complaining, start helping, or quit the Beta. Not a hard concept, the Devs want your help to fix the bugs. As for "Nightraid3r" find me one game that has never had a crash, and has been around for a while, EVERY game crashes at one point or another, the Devs dont lack willpower or Ability, its their job to do it, which is motivation and proof of ability enough. Stop whining on the forums, I've had exactly three minidumps, and EVERY one of them is in this Beta.
Edit* I forgot, just so you know, I have run Sins games on low end, mid, and high end computers, never had any problems.
Cheers.